A couple weeks ago, I picked up a 40qt stainless steel pot (with lid) for about $90 at San Diego Restaurant Supply.
You might try looking around for restaurant supply places, lots of them don't have websites, or the websites don't actually reflect what they've got, so you'll have to call around. I found an identical pot at a supply store around the corner from SDRS for about $40 more, so make sure you shop around.
Also picked up a big spoon and a scale. Restaurant supply stores are great fun to wander around in.