My 12 month subscription to PIA (Private Internet Access) VPN service just expired this week, so looking to try out other VPN service. Reading the feedback on vpn.ac has been generally good, though not as cheap as PIA. Google search shows the discount code BEST20 is still working, down from USD$58 to USD$46.40, saving USD$11.60 on 12 month recurring subscription, meaning the discounted price retains next year when it automatically recharges. Of course you can cancel the subscription if you don't wish to continue next year.
Edit: Thanks to Sleepy24seven, use the code VPNREV for bigger 30% discount.