Electronics are something that you should spend time researching and comparing. Electronics such as Digital cameras and mp3 players are easily researched on the internet and can be compared in price with the help of websites such as froogle.co.uk
If you are investing in a pricy electronic gadget then i highly recommend that you have a good look at the sellers feedback and contact them BEFORE buying if nessicary. If not are not sure about the seller then do not buy, and always pay using a safe method. NOT CASH, WESTERN UNION, BANK TRANSFER OR NOCHEX. Cheques are traceable but not the safest, PayPal is the safest, and make sure there verfied!
If a Seller insists on CASH, BANK TRANSFER ECT. SIMPLY DO NOT BUY UNLESS THEY OFFER AN ALTERNATIVE. A GENUINE SELLER HAS NOTHING TO HIDE!
I HOPE THIS HELPS...MORE OF A SAFETY GUIDE RATHER THAN ELECTRONICS BUT ITS WORTH IT.