Target has turkey fryers with a propane burner and 30 qt stockpot on sale for $30.

It's not just a great canning pot (which it is) but also a great full processing setup. I used a propane tank, (like goes with an outdoor grill), and this kind of cooker- to can for years on our screened and windowed and well ventilated with overhead fan, porch. I was able to can rain or shine. These kind of cookers bring the water to a full boil FAST in comparison to a typical stove burner and can do it on just a medium setting on the adjustable flame (this baby can COOK!), and when proccessing a full potload of jars, keeps that rolling boil easily. The propane tanks last for many, many, many canning sessions.
If you go for one of these to can outdoors (or in a well ventilated but covered space), just make sure when you buy it that it is one with a VERY STURDY, WELDED, four leg, (not 3), stand. Picture the weight it must hold and the mess it would make if a leg buckled, and get the one that's higher priced but safer. Also look for one that has a top surface that will hold almost any size pot, not just the big one that comes with it. Even the higher priced ones are really worth not having that amount of water bubbling away in my small kitchen in August....You know what I'm talking about.....

I've used it to do the first 8 hours of cooking down a large quantity of apple butter too.
Oh- and it's given us cooking and water heating capabilities in power out emergencies as well.

The Amish use a similar setup, but the sturdy 1,2 or 3 burner, metal based, stoves are run with kerosene instead of propane, though Lehmans also carries propane ones.
If you've never seen Lehman's it's a catalog and now online store, located in Ohio USA, for mostly nonelectric goods. They serve the large Amish community there.
They have the huge stainless steel canners that hold 15 qts at a time, (they even have wood fired canners!), all kinds of food and grain mills, hand cranked butter churns, pressure canners, dehydrators, apple peelers, cider presses, kerosene lamps, wind up radios, dairy supplies, poultry etc. They even have full size kerosene and gas refrigerators and the most beautiful old style, full size , wood powered kitchen stoves. I included the link below- check it out- I've gotten many things from them over the last 30 years, for my self sufficient lifestyle. Only the prices have gone up (like everywhere- quality products can cost big money).
They also have some electric things as well that a canner could sure use.

Reba

Here is a link that might be useful: Leman's Non Electric online catalog

Well, I swear by my electric turkey fryer for BWB canning. I set it up near the sink so I can turn the spigot & drain it. I like not having all that BWB steam in my face while I'm cooking jam.