First I'd like to say WOW, what an amazing module, congratulations guys!!!

Second, my apologies if this is answered elsewhere.

I want to sell membership roles for my site. I've set up a "full membership" product that the user can buy and checkout with, which upgrades them to my "full user" role once payment is approved. NICE.

The trouble is, I don't want them to be able to add multiple "full memberships" to their cart before they checkout. So it would be good to be able to remove the product from the product list once the user has added it to their cart once. What's the easiest way to do this?

Thanks in advance,
Peter.