paid to promote websites are websites that paying members for promoting links, as a member you can promote these links any where, and you will earn money for these link views.
here are the cheapest traffic providers for your paid to promote links:
cpx24.com is a paid to promote website, it is also offer traffic with cheap price, it has good traffic with good CTR. the minimum CPM for traffic is 0.2$, and you can choose specific countries.
same as cpx24 but it is offers 0.11$ CPM for usa visits
popads.net is a popunder popup advertising network, as an adveriser, you can buy high quality traffic for your ptp links starting from 0.1$ per 1000 visits.