Here's a sticker site
http://www.flagstickershop.com/reflde.html
If the 2 3/8" X 4" size is still too large it looks like you can get 1" X 1 1/2", but only with the sheet of 6 stickers for $2 option. That size doesn't seem to be available for all of the countries so look for wherever you're travelling, maybe they'll have them.