If you're willing to drop to composite, you could try something like this

http://www.amazon.com/ViewHD-Univers.../dp/B0080KN18K

No idea if that's any good or not, just found it googling around

This one costs a little more but will give you s-video

http://www.amazon.com/gp/product/B00...H4Q6M945W9CEPA

again, no idea if it's a good product or not