Oh, it's much easier now. You must have bought a long time ago. Point and shoot now
Discussion
I just went through the process. I don't see a way to select bitcoin. Just credit card and paypal.
Back out to the main page and click in the top right for Bitcoin.
I have specific packs there. Nothing I can do to get Bitcoin on my normal checkout.
If you don't want the pack I have just DM me your order and I'll send a lightning invoice or you can just zap me