Was it called "Home Computer Club"? I remember it had a couple of exclusives too, such as the Total Eclipse 2 bundled with the original (possibly the Castle Master sequel too)
Special Reserve was more of a subscription to get cheaper prices I think.
Was that Special Reserve you're thinking of?
I remember the type of thing he's referring to, used to see lots of ads for book clubs run on similar lines. Great first offer, then you are tied in to a year of expensive books, once a month - if you don't pick they just send you one! I'm sure everyone's Mum and Dad will have joined up...once!