Hilton points(RCI), Wyndham points (RCI), Bluegreen points (RCI), mandatory Starwood SVN units (II) and Hyatt (II) include membership. You generally pay another $100 or so in mandatory membership fees and with the exception of Wyndham you can't add other TS into that exchange company account. So you are paying the fee, its just mandatory.
In II, Marriott to Marriottt exchanges are discounted about $40 over the regular exchange fee as are Starwood to Starwood.