Good thread. Also I just wanted to say that I've had multiple positive experiences buying new yet genuine/OEM bands from the user "chargerstore" on eBay:
https://www.ebay.com/usr/chargerstore
They sell... literally thousands of bands, but I've never seen a fake band on their page (and he takes photos of everything, no stock images). Like for example, if you wanted the original Green Sport band from the Series 0 Apple Watch, well... there's even a listing for that, too:
https://www.ebay.com/itm/Original-O...094179?hash=item5d91dc53a3:g:KawAAOSwHBZdZkEJ
Also an excellent source to find rare/old/discontinued bands at a good price, that are technically new, but not with the boxes.