there are nowadays several reliable cashback or rebates companies, who sometimes are in a fight for the highest rebates. I get myself rebates from
CashBackForex: Highest Forex Rebates
and think that it is a reliable partner (speaking for the last 7 months), rebates paid prompt every month to my paypal account.
very happy with their service. and prompt answers from servicedesk (not that you need them, but nice to get a quick answer when you ask something)