Pure VPN is the best choice if you ask me I don't really recommend the very big & popular VPNs put there cuz they don't usually care about their quality of service doesn't matter of they pay big if the service sucks the costumers won't use that vpn for long.

Sign up to their affiliate program here: https://www.purevpn.com/affiliates

Also they have $100 bonus for the first month if you get 5-10 sales in the first month literally just get them to try the $0.99 trial and you can easily get $100