Membership best way to "Cherry pick products"

Hi folks,

I have a Membership plugin based site up and running with a couple of hundred products and a couple of membership levels - so far so good!

I would like to be able to sell an individual product to a visitor, without the requirement to become a full member. Is there a best way to go about this? At first I was thinking of creating a new membership level for each product (or small group of products) - but this approach could get really unwieldy. Is there a better way of doing this, a kind of "Pay per Post" option, or using categories or something?

Many thanks,