I got mine for £49.
They asked me to keep the additional box for £5 but I was only obliged to keep this for 30days as it was an additional service. So I cancelled it 2 weeks into the 30 days and they came and collected the box and didn't charge me any extra.
I know a few people who have done the same and I know a few who just got it for £49 with a little bit of an argument. Even getting my £49 back when I switch back to a v-box