Limiting a subscription to a specific usergroup?

[Spaz21]

So we have a couple of subscription products that we only want to make available to a specific usergroup. It's basically an admission which is discounted for our current paid usergroup and the other usergroups would need to pay full price for it.

Can I make the discounted product ONLY appear to the Paid usergroup? I found an old mod for 3.0 but it seems to be dead and I doubt it would work with a current version anyway... is there an easy way to do this?