The moral debate has been done to death. The thread will be closed if suggestions to "keep the keg for the deposit" continue to surface. The OP asked for a legitimate way to buy a keg, not a way to justify obviously underhanded actions.
If you plan to chop the sanke to make a keggle does it matter if the stem is bent?
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If you don't sign a lease or rental agreement when you pick up a full keg then no liquor store in the world is going to be dumb enough to make the deposit less than the replacement cost.
Last week I bought 2 legal kegs from my local metal scrapyard/recycle center for $30 each.
I'm pretty sure it's 100, but the ones I saw on CL are in the 40-50 range. That's in the triangle area.
When I bottled beer, the bottles have a deposit. If I dont return those is it stealing?