Garden Route Golf Passports offers various green fee or green fee & cart options covering most of the courses stretching from Mossel Bay to Plettenberg Bay. If you're a member of a local course here, then the basic packages aren't going to appeal to you because your own member rates will be lower (same with the special Southern Cape affiliated rates offered out of season). But if you're a visitor to the area, they certainly will be good value. And whether you're a local member or a visitor, the rates on the championship courses (see their Albatross or Championship packages) are where you're really going to see value - to the tune of R200-300 a round on courses like Pinnacle Point (Mossel Bay), the Montagu or Outeniqua at Fancourt (George), Oubaai (George), Simola, (Knysna), Pezula (Knysna), assuming you'd normally take a cart on these courses (you pretty well have to as the distances between holes is pretty great on most, with the exception of Fancourt where walking is actually mandatory, unless you have a medical certificate). My experience is that you can book your tee times in advance and change them as needed with the individual clubs.
It's also worth checking out the Garden Route golf deals on Flook - some are stay and play, but they also have green fee-only deals, mostly in the post-holiday season.
And finally, if you like Oubaai, they have a couple of deals that are worth keeping in mind if you plan on playing a dozen or so rounds there. You can get 15 rounds for R5832 (the normal price during peak season for a non-affiliated visitor is R800 per round). You'll still have to pay for a cart which is R300 (so R150 each if there are two of you). They have a similar deal for 30 rounds at R8343. Both the "Club 15" and "Club 30" include unlimited use of the driving range & practice facilities (probably the best you'll find within 50 km's - and certainly the closest), plus a variety of other benefits, such as food & beverage discounts, etc. Full details here. If you decide to take them up on their offer, tell them you heard about it on TheIslandGreatBrak.com! :)
For the full low down on golf in the Garden Route, check out the Golf in the Garden Route section of this website.