I've just started building up my shop myself and was a bit overwhelmed by some of the prices out there, but when I looked further I realized, as with most things, a little patience and research can get you some good deals regardless of what you are buying. The internet is a useful tool but it isn't the end all to where to buy and sell stuff. Ask around, people you know, people you work with friends of friends. I've come across a lot of people with advice on where to find blacksmithing stuff at an affordable price and it has panned out so far. Antique shops are a great place to get a deal, not because they are known for bargains but because no antique dealer in their right mind wants to keep old dirty tools in their stores for long, they are heavy and take up a lot of room so they want them out as soon as they can get a buyer.
I'm still eyeing out a deal on a fire pot though.. I'm sure I'll dig one up for a deal soon, this site itself is a great resource! ;)