  Horse penicillin. 
Believe it or not you can buy huge vials of injectable penicillin at farm supply stores for a few dollars, no questions asked, no doctor's prescription required.  Enough to cure a ship full of sailors, the amount of drug in this bottle would no doubt cost a bundle if you got it from a human doctor.  The one person I know who tried to save money this way lived to regret it. 
Source: Farm & Fleet 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 17 March, 2009 
Price: $7 
Size: 2.5" 
Purity: <10%
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