Another affiliate program that pays via paypal is the GPT referral programs that offer instant paypal cash. You sign up as a member but when you promote the site - you get the same benefits of instant paypal cash and real time credits for the offers completed by your referrals. Cashouts occur automatically via paypal when requested, are unlimited and can be done 24/7. I've had the best luck with the new GetPaidTo and CashLagoon. Best of luck!
I've been using InstantDollarz as of late but it seems that more and more affiliates are moving in this direction...