Overstock.com has a stainless steel 9 gal pot for $58 that is perfect for 6 gal batches:
http://www.overstock.com/Home-Garden/Bayou-Classic-36-quart-Stainless-Steel-Stockpot-with-Lid/6165681/product.html?cid=123620&AID=10668447&PID=3705318&SID=skim1043X499650Xd143ecc6d80c778096a29ed1b6996745
I use this exact pot and its good quality, the handle rivets don't leak and it comes with a lid. Been happy with it for more than two years.
Just spreading the good deal.
funk
http://www.overstock.com/Home-Garden/Bayou-Classic-36-quart-Stainless-Steel-Stockpot-with-Lid/6165681/product.html?cid=123620&AID=10668447&PID=3705318&SID=skim1043X499650Xd143ecc6d80c778096a29ed1b6996745
I use this exact pot and its good quality, the handle rivets don't leak and it comes with a lid. Been happy with it for more than two years.
Just spreading the good deal.
funk