We've found a printer who will produce postcards from prints or ( for a small extra charge ) slides. Short runs are not economic, but 1000 cards can be had from about 80 pounds. They're reasonably good quality cards, at least as good as those you see in racks in the tourist shops costing 15p - 25p and you can have a few words of description on the back.
The photo's need to be sharp and well composed; it's not worth trying to crop a good picture from the middle of a distant view. 35mm or larger films are best.
If you've got or can take a good photo' of your giant, this might be a way to earn a little money from interested bystanders.