Got a 2 cards through today with 3 months subscription to TescoDVD rentals, and the codes are the same on both cards so should be unlimited usage

www.tesco.com/rentalgift
click on sign up and then use code TDRXMSRAF8

You prolly have to enter your card details but once the 3 months is nearly up, just kill it off and you pay nothing.

You can rent games, films, and blurays.

it says you can't use this offer if you've used a free "lovefilm powered site" offer before, but it can't hurt to try.