Not sure if this link works or not, but there's the listings on ebay that are already completed.
http://search-completed.ebay.ca/sear...fsoo%3D2&fgtp=
They range quite a bit, with a low of $105 with a high of $225. It looks like the majority are going for $125-150. If you expand the field to include USA phones (like verizon), they average $75.