You don't have to use the 'goods' provided, you can make up your own items. I have a set of 1/76 scale LP covers produced for military modellers printed on photographic paper after the style of 'Tiny Signs', a friend of mine has used them on a Wills market stall and they look very effective. All sorts of things can be sold on market stalls, what about bags and suitcases, there are plenty of model bags and cases you could use.