I really can relate to what Info Guy said with his reply. You really can not treat CPA offers like other Affiilate programs. From what I have researched on this topic many of those within this industry will use paid adds. However, with this method you can actually lose more than you gain with it.
What I tend to do is I try to blend in these types of offers with my other affiliate long term offers. Sometimes I will even put in links to things that a person can get for "FREE" by clicking the CPA offer link. It does not make me rich, however, by blending them into my topic of discussion it comes across as natural, and giving them something for free, while at the same time I can do several things with that one vistor..
(1) hopefully get a subscriber to my list
(2) Provide them with other FREE-- CPA weekly offers
(3) Sell them some of my other affiliate products along the way
This means that I have a better chance than just hoping to convert a CPA offer like Info Guy said by the time traffic gets to it the offer might already be gone.
That is what I would do to try to earn money with CPA offers, and still stay within my tight budget for advertising expenses.
I hope my answer helps you further with the question you have asked.
I look forward as well to hopefully getting some more tips on how to effectively accomplish this task.