Nope, I'd look for a whole used setup.
This is the one I picked up:
http://forums.hybridz.org/showthread.php?t=132038
I just got my tank last week. I managed to get the tank for $25 in a #2 size at the fleamarket. Went to TSS and for $20 I can switch to their brand and get it refilled.
I spent $46 total for the exchange and gas, and of course, they had no #2 size tanks in stock. The guy had no clue what he was doing, and he told me to take what ever I wanted. I didn't want to be greedy and get a #4, so I got a #3 instead!