When Something is too good to be true...well.. It is.
Rule of thumb there is never a free lunch.
Best place to check on the going price for something is to go on EBAY. Really. Do the search for whatever item you want and you'll get an idea of how much it costs. It is generally much cheaper than buying it here in Qatar, about 20 to 30% off. But you have to have an account with Ebay, and a seller that accepts shipping to Qatar. You can have a a Shop & Ship account with Aramex, and shipping rates are ok for small items.

Just always be on the lookout for scammers. Never send money through Western Union or other money transmitters if you don't know the recipient.