Check with the trader how long you can expect to wait. If you do have problems with purchases from abroad and the goods don't arrive or are broken when they do, it can be difficult to get your complaint dealt with. Your contract is in the country where the trader is based and legal action can be difficult to take. The Office of Fair Trading suggest that only very inexpensive goods should be bought from companies outside the UK or Europe to limit the risk. Shop around before you buy.
Prices can vary as much between retailers on the internet as they can on the high street.
Always try to look at more than one vendor. And finally, don't use your debit card online as a method of payment. Often this hasn't got the guarantee money back protection offered by credit cards.