AirVPN has 25% off all purchases until June 6th. Their regular pricing gets cheaper as you purchase longer subscriptions, so the best overall deal is to buy 1yr at 25% off which comes to $45.43 total, or $3.79/mo.
The discount is applied automatically during checkout and works for new and existing accounts.
AirVPN has guides for setup for almost any device/OS, and a config generator with a lot of options for whatever advanced needs you have. They are no logging, no bandwidth limit, all protocols allowed, and up to three simultaneous connections.