Can't name the site as it would be blatant advertising, but I've just ordered some aviation print xmas cards from the shop website for a very large international air display type of event that takes place somewhere in Wiltshire in July. (If you're still stuck, look at the classifieds on p88 of this month's Aircraft Illustrated).
They do many different kinds of cards and calendars, including a selection of funnies. Roughly 10 cards for £4.