We have a Co-Op Dividend Card, as most of the local shops in the villages around here are Co-Ops (as well as our nearest supermarket). When we got it I think we thought it was going to be like having a Tesco clubcard or something, but then all this stuff came back in the post saying we'd joined the Co-Op and telling us about local projects they're involved with and how we can have our say.
We were a bit surprised, but I quite like the idea of being a member. Especially if we're going to get paid.