SMB West for ours. Lynn was super helpful in getting more info etc...was able to still negotiate a little w/ the owner. I did miss out on another van that i found on Craigslist, crazedlist.org was super helpful in that search.
whatever you do, be prepared to act pretty darn quick. Definitely have most of your finances in line and be prepared to hop on a plane and be ready to bail if it is not what the pictures lead you to believe.
I lucked out after I missed out last minute on a SMB in soCal, one appeared on the SMB site 15 miles away a week or so later that had all i was looking for.
2002 EB51 7.3L w/ Stage 2- UJoint 6" 4x4 Conversion
2001 RB50 V10 Quigley- SOLD