Last call can really be that cheap, but some of the resorts you see in Last Call have resort fees. Be sure to look at all of the information before paying even $299.
Example we just heard about from a friend here on Maui. They took a Getaway/ Last Call for $400 for the week in Lake Tahoe. When they got to the resort, because it is Diamond/ Hilton, they were told the fees for parking and concierge for $350 total. They were told that Hilton Vacations would make that $350 in fees go away, if they book a timeshare presentation. Nothing was in writing, so they declined the timeshare presentation. Salespeople lie, so there is no trust that the $350 would go away.
Now the week they bought was no longer the bargain they'd hoped for. Diamond/ Hilton charges the parking fees at Orlando resorts of at least $25 per day. That's a ripoff, but people book them and are surprised at check-in. Go into those deals with your eyes wide open. Wyndham, as far as I know, doesn't charge parking fees to exchangers for Bonnet Creek or their other resorts in Orlando. I would not hesitate to book Wyndham via RCI Last Call.