Yup, we do that quit a bit. Usually a member posts a part they've found on ebay, CraigsList or a salvage yard and other members contact the seller to see if they have other VX stuff. I do it very frequently.
I also tell the seller to expect more calls/contacts from our group.

Last year Moncha even created a couple new categories to capture these various finds:

1) Internet Parts Found -it's a SUB-FORUM under "Miscellaneous Items for Sale"

2) Vehicles For Sale Found Elsewhere -it's a SUB-FORUM under "Vehicles for Sale".

3) Salvage Yard VX Found - Main category forum