I've been with at least 12 affiliate companies over the years that had CPA offers, unfortunately many have closed their doors due to lack of either advertisers, lack of affiliates, bad management, or insufficient long term planning. There's a website called Affiliate Company List where they list a selection of affiliate companies that pay out commissions via CPA (Cost Per Action) that you're asking about.
I've used a few companies listed there with good success, however it's always good to keep your eyes and ears open for newer companies, many who will only launch after they have a large enough selection of advertisers and enough varied CPA offers so it brings in a large amount of affiliate marketers to market for the advertisers. It's also a good idea to do a Google search on occasion for affiliate related terms like the CPA you mentioned to see if there are new companies out there that will enough CPA programs for you to choose from.
Hope this helps, have a great day there!