Where to buy...

[AlexColeman]

Adorama.

 

[N1LSS]

I'm an amazon fan boy myself. I've yet to have a bad experience with them, and prices are always low

 

[EhJsNe]

I would test something out first, at best buy or local camera store, then purchase off line (if cheaper) at places such as B&H, Adorama, and Amazin. sometimes ebay is a good place to get deals.