OK rakeback is available from rakeback affiliates. Unfortunately this site is in direct competition with RB affiliates, so your gonna have to do your own research. TBH, rakeback is only gonna be of use to you if you play on a regular basis. If your a casual player I would suggest you sign up via CC availabe bonus programs here. You will receive decent bonus, courtesy of Nick, and you help the site.
However if you play on a regular basis at one particular site then, I know this won't make be popular with mods etc, but rakeback is a must.
Stars doesn't offer rakeback, but you do have Vpp's/Fpps, which in itself is a form of direct rakeback offered by Stars.
