Sweets! I thought of that the other day. A came across a shop in a city centre - it stocked only usa and japan/china sweets. WOW they cost a bomb - but they were totally unique to UK products. Just need to be sure of their sell by date.
Pipes do very well, even new ones - spotted them a while ago - they just don't get me going :D
Believe it, or not. Back In the day homemade baked cookies, and brownies sold well on eBay, true story. I bought some myself. This was before the world went mad when people became powersellers from creativity.