I'm in the same boat but im looking for at least a 55g to put outside ...
Ive found one in Austin but that's about a 2 hour drive and Andrew (sinner) found some but they were used and had chemicals in them
i actually called dave and he has some from $10 and up for 5g-30g. Did not ask about teh 55g but i saw some on his website. You may want to call him and ask. He has "food grade" and "non food grade".