We mostly buy electronic gadgets from AMAZON.com only, it is a trustworthy site to buy all this kind of stuff.
So Far I have bought 2 External Hard disk and a bluetooth Device and some more electronic stuff. Their customer service is really good and help you out with any issue on time.
I never faced any problem till now, also their deals are very good sometimes specially in their sale season.
I am a happy customer of AMAZON so far.