I know there's some listed here in the marketplace. Some aren't that good for scraping Google. I'd like to hear which rotating proxy providers you use. I'd also be interested in knowing how long you've used them. Some places it seems, rarely, if ever replace the proxies in their pool.
I'm not looking for a free service. The big companies all have limits on the amount of searches you can do. At least if you're not willing to shell out big bucks. Does anyone know of any place that has a reasonable fee that will allow an almost unlimited checks of domain metrics?