Look on wayfair.com I bought a 48" complete with top & sink for about $1300. Wyndham Collection. You may find the 36" in your price range. I've been very happy with it

Specs:

• Constructed of environmentally friendly, high grade solid wood, plywood, and MDF, engineered to prevent warping and last a lifetime, 12-stage wood preparation, sanding, painting, and finishing process
• Highly water-resistant low VOC sealed finish, beautiful transitional styling that complements any bathroom, practical floor-standing design, minimal assembly required, deep dovetailed drawers
• Fully-extending undermount soft-close drawer slides, concealed soft-close door hinges

Do you have a Costco membership?

The same one is sold for even less at the other sites: https://www.build.com/product/summary/1793838?uid=4239512 But I am hoping to find something for less than 800

You do not get quality in that price range. What you get is inexpensive import stuff, sold all over the internet, like a cheap sweater that lasts for one season.

Go to a local cabinet maker and buy quality that will last.

I am a penny pincher and a bargain shopper. But, when it comes to a bathroom cabinet, I would not buy anything for a 4-5 year plan. A replacement cabinet may include wall resurfacing, painting, and flooring upgrades at the least. A few hundred dollar savings is not worth it.

But, if you are really looking to save, head to your local Habitat Restore and see what they have to offer. You can paint an 80s oak cabinet white and find a quartz top at menards.

And FB Marketplace. Scads of used vanities on MktPlace in my area.

Marketplace for sure! Solid wood will avoid not only replacing in a few years, but potentially having to repair wall and flooring. Found this one as an example in a minute or two.

No, I would rather pay $1000 and get the new one. I need white color and I don't want used.

The person in the first comment said that the Windham collection that costs around $1000 for the 36" vanity is pretty reliable and good. Are you saying I need to pay 3-4 times more for what exactly? There are a dozen of so vanities on the Home Depot web site for 1-1.5K made of solid wood and plywood. I don't think your comment is serious, sorry.

Installation is a separate issue, I will be paying for that, obviously.

I think you should go for the lower priced vanity from HD or big box store, but ensure that your fan is ventilating properly and upgrade as necessary. A wet bathroom will destroy anything.

A quality MDF vanity--dovetailed joints, soft close and good hinges--will serve you well provided humidity is controlled and your family doesn't treat your home like vagrants in a public shelter.

Ours was HD--15 years ago, used by a family of 5 and looks good as when new.

All of those cheap imports are cheap for a reason. You don't have the actual experience with building cabinetry to know what is and is not quality. Spend your money twice, and you will learn. You do not get quality anything at that price. You get meh to poor quality, and an import source. Nothing domestically manufactured, or built with quality materials. The BS marketing of "plywood" on these imports isn't a hallmark of quality. Some of the worst warped stinking delaminating materials possible are "plywood". Meanwhile, Medex or Extira are used outside in all the rain and snow.

The 18 y.o. MDF vanity from HD that I installed in DD's bathroom still looks like new. A little TLC, including prompt clean-up of spills and ensuring there are no plumbing leaks or overflows, is to credit. The same with our Kitchen cabinets.

YMMV

Perhaps they made them much better 18 years ago. Which brand?

A ready made 36" should NOT be squeezed into 36 3/4 space. You use a 30" vanity. It will have two sides, both finished if anything purchased internet or not custom to your space.

You can buy one for as little as 500.00 and supply only your faucet.

30" ( no assembly required )

As with all of life- price, quality delivery..pick two

https://www.wayfair.com/home-improvement/pdp/andover-mills-rossi-30-single-bathroom-vanity-set-w004415793.html?piid=97672268%2C58310132

When I needed a new vanity for my bathroom and wanted a vanity that was not a "typical" size/setup, I ended up ordering kitchen base cabinets at home depot and then having a vanity top added.

It was the most economical way to overcome the limitations of standard vanities and not pay for a custom build.

In my last home I was able to find appropriately sized vanities at home depot on a closeout sale. I would not have replaced our vanities if these were not so inexpensive. Had planned on painting/replacing sinks.

Depending on the style of your home there are other creative ways to create a vanity.

My one niece has an antique dresser with a vessel sink on top in her farmhouse. My one nephew had an apartment built in an old factory with a very industrial feel. The bathroom vanity had a stone or concrete look sink attached to heavy black pipes with a couple of shelves underneath.

Similar to this:

Not everything needs to be something off the shelf.

JAN MOYER - I currently have a 36 inch vanity already installed there in this 36 and 3/4 inch space. It's just old and outdated, because I just bought this apartment. I just want to replace it. This cabinet is 35" wide and the top is 36" wide + the side backsplash. See below.

I can't stand when there are little gaps between a vanity and a wall - either have it to the wall or have enough room to clean around.

If this were my space I would be looking at a built in vanity (does not need to cost a fortune) and I would avoid doors or drawers that don't open or open only part way.

looking at a smaller version of this

https://www.houzz.com/photos/spruce-project-midcentury-bathroom-denver-phvw-vp~132215365

Spruce Project · More Info

Or something with just shelves underneath.

I use Godmorgon for many bathrooms they are affordable and last very well and have great storgae They are from Ikea and honestly 3/4 " is not a big deal unless you go custom it is what it is . I often get the cabonet from Ikea and thos counter a remant from a stone yard that woudl eliminate the gap at the top

It doesn't look good, and the tiny gaps are absurd.

It seems there would be no RUSH to replace the one that is there. What you are going to get at a reasonable online price will look much the same.

Not. Modern. Enough

I would at the least do a floating vanity and be free of conflict from the baseboard heat.

Why must it even be white?