You can buy a cheap stainless stock pot at Walmart. For soaking, I use semi disposable Rubbermaid kitchen containers, so far my wife hasn't noticed. There is some expense in getting set up, but I've done several guns including rifles since I started rust bluing. Aside from the time invested(which I enjoy), I've refinished quite a few guns and haven't exceeded the cost of even one cerakote job.
A refurbished pre-b may not be much cheaper than a new B, but at least with a Transitional model, you'll have a tuned gun for not much more than the price of a new B. If you tune the B with Cajun parts, and add sights, the pre-b becomes even more attractive from a cost standpoint. That said, I think there's just something special about a nice pre-b.