You'd have to PM the sellers you are interested in dealing with to find out if they are willing to take something alternative. Honestly, most other payment methods when substance is involved are suicide, since most other ones can be traced, or anonymous ones block Tor nodes (Liberty Reserve).Pecunix is the only one I would even consider accepting outside of here, and that's only because no ID is required to sign up and create accounts, and everything can be done over Tor since they dont' block any Tor nodes.