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I always like to say, Quality Traffic is better than Quantity. So with that in mind, it is better to get 1 click and pay .50 cents, rather that 10 random clicks at .5 cents. This is just my opinion.
There are plenty of other small network ppc's like searchfeed and epilot. I have never used these so it will be great if others can post about their experience with smaller ppc networks.
I know there are also those expired domain traffic places. I have never tried these so someone else is gonna have to help you on this one.
Let me know what area of shopping you are targetting and i'll be glad to compile a list of helpful terms that may be low priced and convert at those low clicks.
KG