Gift voucher to stay on a CC site

I've a few friends with caravans and also one folding caravan who are not in any club at the minute who would like to sample a few nights on a CC site.

Do the CC sell gift vouchers so that i could purchase a couple of nights stay as a present to them so they can sample the great facilities etc before they join?

Of course the cost could be at a non member rate but allow ME to buy them a stay of say of 2 nights?