VRI*ety currently contracts with Trading Places to handle their internal exchange system. The inventory available through VRI*ety includes everything available through the general Trading Places website, plus some deposits at VRI-managed resorts that are only available to VRI owners, not to the general timesharing public.
The VRI-only inventory includes some very desirable weeks, especially in New England and Southern California. But many of the VRI-only deposits get snatched up by ongoing searches, so they may not get posted online.