Lik-Sang has the Japanese one, which should work with US GCs/TVs. And they are a reliable company but the price is higher than it is at the Nintendo store's.
They always go on backorder on their website. There are some 3rd party cables I have heard of but I would order the Nintendo ones and wait a couple months.
I think Monster is the one who made the other component set. I know when I ordered my component cables, I had to wait 3 months before they got some in stock.