Be careful with really cheap cables, folks. These aren't digital connections like HDMI cables, so cable quality does matter. I'd get yourself a set of cheaper cables and a set of Nintendo's cables. If there's no discernable difference, then great (I've not compared anything myself), return the Nintendo ones. But if there is and you deem it worth paying for, you won't shortchange yourself. I've heard random accounts of some 3rd party cables doing nasty things to the Virtual Console games. As to that claims legitamcy, I can't be sure.
That being said, don't get suckered into "premium" cables, either. Nintendo's are going to be the best you can get for the price and anything more expensive will literally be throwing the money away.
In short, don't fall for the "SOLID GOLD $100!!!" cables, but likewise, don't wast $10 on getting tinfoil component cables either.