Here is a 2-track split from Melvins and The Jon Spencer Blues Explosion, both covering "Black Betty".
From Melvins facebook page:
"You've probably already heard, but we did a split single Jon Spencer Blues Explosion as a tour single, both bands covering "Black Betty". Are we touring with JSBX? No, but they're taking their share of the single to Europe for their own tour now. We're selling the rest at our Endless Residency shows. The tri-colors are mixed in with the splatters, so you get what you get."
Unfortunately it has been sold out so the digital form is the only way...
Melvins # The Jon Spencer Blues Explosion # Amphetamine Reptile Recs