[CHAT] Black Anchor floss

So I've been trying to get black Anchor floss because it's supposed to have better coverage than dmc 310, but I can't find it anywhere! I ordered some on Amazon but they sent me white, and when I put in a request for an exchange they said they couldn't do it but they'll refund my money anyway (so I guess I now have three free spools of white thread lol).

I've looked online at Joann, hobby lobby, Michael's, Walmart, and 123Stitch but no one seems to have it! Any ideas of where else I can look? Or another alternative for black thread? I'm trying to do a blackwork stitch-a-long and I need black for the border, but I know 310 isn't great for blackwork because it's so thin compared to the other dmc thread.