Ok, the cheapest cab I can find, new or used, is a PRS Archon 1x12 for $379 with free shipping. No way am I paying $600 - $700 for a 1x12 though. If the (used) Friedman is that much better than the others, I might grab that one. Not sure if a 1x12 would benefit form a port or not, considering my goal isn't to use the cab for actual playing, just to demo speakers to see if I like them for a 4x12?
PRS Archon: $379
PRS MT: $450
Friedman: $560 (used) or $700 (new)
Hiwatt: (front ported) $475
WEM: (same as Hiwatt) $440
EVH 5150 III: $470
Mesa Rectifier "23": $600
Suhr: $640
Soldano: $700