Prepay by volume VPN
Ranked in these QuestionsQuestion Ranking
Pro Clients for OSX, Win, iOS and Android (usable manually by Linux)
Downloadable clients for OSX, Win, iOS and Android.
Pro Prepaid by volume, no commitment/contract
There are many great month to month or annual VPN offerings, but Private Tunnel is (AFIK) unique in offering pricing based on a volume. This is a excellent option for those that don't need regular/frequent VPN service. Prepaid packages never expire and can be used on multiple devices.
Pro Free 100MB starter/demo plan
Offers a free 100MB package to try out the service