Average price per tablet/capsule (minimum-maximum) of drugs with as consistent formulations and quantities as possible (not purchased).

*Not all websites offered drugs in the same, consistent quantities.
**There was greater variation in the quantities for Viagra® than for the other drugs. Quantities ranged from 3 tablets to 10 tablets.
***“Physical-location pharmacy”: Pharmacies were selected as the closest within a 0.5 mile radius of the lead author's home address (using Google Maps). No more than one of each chain pharmacy was selected. In addition, the authors included a nearby Wal-Mart store. One pharmacist refused to provide price information.