Part of the costs of healthcare includes drug prices. You would think with all the competition in pharmacy availability that the pricing would be fairly close for most drugs. That turns out out be not the case.
Boingboing posted on this today, and I link here to the original post they reference:

So Wolf began snooping around and found that two chains, Costco and Sam’s Club, sold generics at prices far, far below the other chains. Even once you factor in the cost of buying a membership at Costco and Sam’s Club, the price differences were astounding. Here are the prices he found at Houston stores for 90 tablets of generic Prozac:

Walgreens: $117

Eckerd: $115

CVS: $115

Sam’s Club: $15

Costco: $12

Those aren’t typos. Walgreens charges $117 for a bottle of the same pills for which Costco charges $12.

So there you have it, if you are buying generics and CVS or Walgreens, see if Costco carries them.

But, be sure to read the WallStreet Journal article which checks into the price differential of other drugs. Questioning pricing it turns out, is a good thing.