Yes, the title is suggestive. Please spare us the stupid gags about drugs, etc.
OK, the last time this one was posted was back in may, but it's a good one.
Healthquick has $50 GC's for sale for $40. They also have 50% off your first order. $2.95 shipping later, you have a $50 GC for $22.95.
NOW, you have a parent, sibling, friend, or pet that can receive mail, set up another account, and get the 50% off again. Voila! $100 of razors, vitamins, etc. for $22.95. Go crazy.