Hi there! The only limitation is that the bills you use must be the same size and be able to fold/cut to make the slit in the bill. If you have two bills WITHOUT windows and are the same size then you'll be fine :)
Answered at 11:01am on August 19th, 2014 by girspiggy (2392 karma)
You can fold the new bills, but you can never then unfold the creases.. also, don't try slitting them, any cut immediately runs and the bill is cut in half.. they are crap.. this would totally work on the old bills.. go to a coin shop and find a keeper..:)
Answered at 03:37pm on April 6th, 2015 by capscats (1 karma)
You can use the old paper money. They are still in circulation.
Answered at 10:10pm on August 28th, 2014 by sean53417 (15 karma)
If they are plastic, how can you fold them? Depends on the thickness, I guess
Answered at 04:23pm on August 20th, 2014 by cclay (25 karma)