Well, play money at least! I was desperately trying to find some play moneyt for Big Muddle's play shop but could only find dollars or euros so I played around on publisher and made my own!
They're not perfect, but laminated they'll last quite well. If you'd like them, here are the files. Right click the picture, choose 'save image as' then print the file as normal. They are set up that if you print on the back the notes will line up...or ought to!