Nintendo sells black Gamecube controllers on Amazon.

are you looking for new one, i go for used ones in good condition and up that's affordable. here's a link if anyone is interested and can't find officials due to soo many 3rd party GCs. https://www.amazon.com/Nintendo-GameCube-Controller-Black/dp/B0000E5U6I?ref_=mw_olp_product_details