10 semidedicated proxies (share) all around 12 dollar. Its enough for small project. I always get sucess rate submission more than 80%. For large project, I suggest you dedicated proxies from stormproxies.
1. Does these sites charge to get a backlink?
2. Are all the sites on your list active? I saw some website samples in last post, it can not create backlink anymore. Or you deleted unworking links in your list.