If you want cheap cables that arn't from ebay you can get them from play-asia for $10, here's the link
got the cables and now my girlfriend thinks our TV is too big. Picture does look good and I went with the nintendo ones
when you purchase HD cables, the thing you want to look for is shielding. cables that are well shielded will resist interference from all the other mumbo jumbo behind your tv.
i got a pair of $20 at best buy and wasnt impressed, so i went back and exchanged them for the $50 psyclones... dual shielded with gold plated connectors... serious improvement in picture quality.