$stocome pmmed me about what techniques i used for CPA promotion.I am posting here, so it may help others.
many things were used to promote,i was in internet marketing for a long time,
I put the affiliate link in my signature in many electronics/tech forums,though i dont think that helped much.
Answered related questions etc in yahoo answers, (people asks which camera is better, just answer them and write,here is a good deal on this site - link)
Sent around 25,000 email (Sorry for spam,but i made money :p).Most of them never reached.
I had a 100$ advertising credit from google adwords, so i created a landing page about the info etc about cameras, added the affiliate link as buy now, and advertised that page in adwords, although they banned my adwords acc after a while.
i didnt used any tracking, so not sure which technique got the best results,but i am guessing it was adwords.