Hmmmm...
for that..
I was looking for the bill switch that doesnt need any folding like the original hundy 500. And that you can perform the switch by just shaking the 5 bills or in full view or something like that.
I think Prophet is the best choice...
since it is very visual and it doesnt need any cover ( a very tiny small cover

)
watch the vid of it...you will like it..
also there is Extreme burn (i think) ...it also doesnt need a cover but you will need a gimmicked THING to do it....
i recommend Prophet scince i have used it and it really gives a very good reaction..
but watch for a problem..
in my country we dont use a simmiler size of bills...so the 1 is smaller than a 5
this will cause you some problem here...as i run through one..and i have cut along the bill to construct the gimmick that make some people recognize that the 5 is a little bit smaller...
anyway i dont think you will face this problem..
Nemro