I’ve made a list of the best free VPN trial I could find. Note that I’ve only included reliable VPN providers that I recommend.
Note: Apparently, PureVPN and VyprVPN offer free trials, but make it difficult to get your money back, so you may want to avoid those services.
ExpressVPN has a 30 day “no quibble” money-back offer. They provide many good client apps and good customer support. They are one of my top recommended providers. Servers in 92 countries.
VPN.AC is a Romania provider with excellent server speeds. The offer a week trial for $2 — the link can be found on their FAQ page under the question “Do you offer a trial period or demo?” . VPN.AC is focused on privacy, and they allow torrenting (from Romania and Dutch servers). They accept Bitcoin, Paypal and CashU.
IPVanish offers a seven days money back guarantee. They state that if you don’t like the service, you’ll get a full refund. Good support for P2P/Torrenting. Servers in 44 countries.