According to my experience, it's not a good idea to buy electronic stuff online, even in UK or USA. When I was in UK, I bought a desktop on eBay, and the seller has over 10k points and 98% positive feedback. However, when I got a problem with the PC, it really took a long time to refund and it also cost you some money for the postage. So, buy those stuff from where you are.
According to my experience, it's not a good idea to buy electronic stuff online, even in UK or USA. When I was in UK, I bought a desktop on eBay, and the seller has over 10k points and 98% positive feedback. However, when I got a problem with the PC, it really took a long time to refund and it also cost you some money for the postage. So, buy those stuff from where you are.