The turkey fryer pots work pretty well for this as long as you are sticking to 5 gallon batches, and don't try to do something typically requiring a long boil (e.g. Wee Heavy). Especially if you use a bit of fermcap-s, you can easily manage boils in those without too much trouble. I used one for a quite a long time before building a larger system.
I am not going to get into the whole stainless steel vs aluminum thing, as there have already been hundreds of threads on here debunking that myth. The only thing to watch out for with those pots is that they are kind of thin, so you NEVER want to heat it empty, especially on a propane burner, and you also don't want to use PBW or starsan on there for extended periods because it will pit the metal.