Thing to check on ANY of the discounters
How much will you have to pay if it doesn't work in your machine?
NE and Frys do not guarantee compatibility. Neither does Kingston on the KVR or Corsair on the ValueSelect. So what happens if the RAM is OK RAM but it doesn't work in your Mac?
NewEgg has a restocking fee of 15%, and according to PCWorld's customer satisfaction survey, they apply that fee at double the industry average rate.
Also, who pays shipping on RAM that doesn't work, you or the vendor? That $5 savings can turn into a $15 loss if you have to foot the bill for shipping.
A good Mac oriented vendor will offer you a guarantee of compatibility, and will pay shipping in both directions in the case of a DOA.
Check it out before you lay down your money and decide for yourself if the risk of generic RAM is worth it for the savings.