I am wanting to build a 64 volt 1 KW battery pack so the AH would need to be around 15 AH but the more amps the better for the price.
Those run about..what...$20 - $25 each? That's the average I'm seeing on most websites. For that price, you may as well just pick a place and buy them straight out.
That is what I have seen as well, I like the brand A123 and have heard a lot of good things about them, but their price is almost double per cell.