The WorkMate series by Black and Decker is probably the easiest to find. I have two, one is an older model (1996 or so) that works extremely well. The newer one(2002 os so) is not as well built.

Buy 2 foldable metal sawhorses and 1/2 sheet of plywood.

This configuration will do the same job better and cost 1/3 what a Black and Decker 'workstation' will....

I've done the sawhorse/plywood thing for painting. But I want the top connected to the legs when it comes time to saw.

Actually, if I am sawing long boards or plywood, I have sawhorses(metal) with 2x4's attached to the tops for that.

The Workmates are more for clamping pieces for sanding/drilling holes or clamping pipe to cut.

graywings-
For someone without a workbench, a WorkMate is very handy for multiple purposes. And if you want a surface to saw on as you described, you can take a piece of plywood, cut it to a reasonable size, attach a 2X2 to the middle of the underside by driving screws through from the top, and then clamp the 2X2 in the jaw of the WorkMate to have a top surface that will stay put. (If you add glue to the connection between the 2X2 and the plywood surface before screwing it together, it should last for many years.)

Like handymac said: fasten 2x4s to the top of to your sawhorses.

You still end up with a much better and cheaper and more durable version than the "WorkMate" for about 1/3rd the cost.

You want to waste your money and buy and inferior amateur product by purchasing a 'WorkMate'???... then have at it.

No professional carpenter or builder owns a "WorkMate".

Why?

Because they are JUNK....

manhattan-
They're not all junk. If you can get your hands on a used version of the original WorkMate, it's built like a tank. I have one that's about 25 years old, and one that is about 10 years old that is lesser quality, but still pretty good. I can't speak to what's in the stores now.

I have a B&D Workmate model 300 which was given to me as a Xmas present in 1984 and at the time I was like manhattan, I thought it was at best a piece of home owner grade junk until I found the perfect modification to make it an indispensable tool on my van.

I have a small benchtop type table saw and compound miter saw that I often take on the job and I was forever trying to figure out a simple but safe stand to use under those tools.

My solution was simple. I began by cutting two pieces of 2x4 equal to the length between the legs, front to back on the power saws, and I bolted those directly to the saw base. Then I cut a length of 2x4 equal to the width of the workmate table and bolted that to the previous 2x4's on the midline.

I made a separate frame and attached it to each power tool.

I can quickly set up the workmate, then open the workmate table wide enough to allow the horizontal 2x4 on the underside of the power tool to drop in the slot. A coupe wuick turns of the workmate clamp handles and i have a perfect work stand, which can easily be folded up an tucked in a gang box on the job, in the back of the van or kept tucked away in a closet at home.

Here is a basic illustration of my idea:

I use two collapsible metal sawhorses and a 5 foot section of old plywood and formica countertop (with 4" backsplash).
Sturdy enough to bolt a medium-duty vice to and I can screw it to the 2x4 runners that are bolted to the sawhorses.

It sounds lovely, randy, but I am looking for something more compact than that. How much does a 5 foot section of old plywood and formica countertop (with 4" backsplash) weigh? And does it fit in a closet? I don't have a basement, garage or storage unit.

It doesn't have to be 5', that's just the piece I had after a remodeling job. Yes, it would fit in a closet. I'd guess it weighs about 30-40lbs. I also use it for scaffolding, so I don't want it to be too lightweight.

Manhattan.
They're not all junk. If you can get your hands on a used version of the original WorkMate, it's built like a tank. I have one that's about 25 years old, and one that is about 10 years old that is lesser quality, but still pretty good. I can't speak to what's in the stores now.

A "tank"?

You kidding me?

A "tank"?

These store bought pretenders are ALL junk!

The very best 'workmate' is ONLY the one you can build.

Don't buy any of the store-available models.

They are all garbage...

Unless you are a kitsch "connoisseur" and really appreciate the best junk available...and don't have any clue what you talk about...Don't buy ANY store-available model!

They are ALL JUNK!

manhattan-
When someone voices an opinion that you don't agree with, is it really necessary to hurl a bunch of negative, contradictory statements as if it's a challenge to your authority? I'll accept that you have never seen a WorkMate you like...fine. I have one that is great and I'm quite happy with it.

I'm a plywood/sawhorse kinda guy as well, but this rockwell caught my attention. I have portable/folding stations for my cut-off saws, but dont have one for my 10" dewalt contractor table saw. This would work!

Here is a link that might be useful: rockwell work station

Oh, I know, I soooooo want a Jawhorse! I watched the infomercial once when I had insomnia. The price doesn't scare me, but the 43 pounds of weight does.

Hate to butt in butt Manhattan is wrong about this.

I have an old one too and it is everything Kudzu says it is.

Not garbage. Not junk. Not a pretender but a very good tool. There are obviously other solutions available and I would certainly not buy a new one. Mine is probably even older, I think close to 30 years and has lasted this long under very heavy use. Should I find another one like it (unlikely), I would not hesitate and it would probably be the least expensive of all the proposed solutions.

I am not sure "no place to put one" means, exactly. But a reasonable alternative are "shop boxes" and I-beams.

Here is a link that might be useful: Shop boxes Sketchup Model

bobsmyuncle - No place to put one means I have no place to store it when not in use. I don't have a garage and I don't have a basement. If it folds up, I can maybe tuck it in a closet or to the side of the washing machine. But short of leaving that box in my family room, I don't have a place to store it when not in use. And if I had a work station to make the box you link to, then I guess I wouldn't need to make it, now would I? :)

Last year when I ventured into window repair and paining, I set up a folding table in the family room and laid freshly painted windows on the dining room table to dry. With slow drying paint and window glazing putty, that got old quickly.