If you haven't seen this utility money prop, you should consider it:

https://www.codyfisher.com/product-page/the-big-tipper

Just received it this week, and it is very well made. Cody shares some great ideas for adding a ton of comedy to your entire show using this prop. Not a trick on it's own, but a tool you can use in almost any bill to impossible location routine.

Highly recommended.

I purchased this mistakenly thinking this was his gimmick to load a bill directly into a lemon from the tip jar. This is something he described years ago in his bill to lemon manuscript and although I tried I was never able to make one, I'm not great with crafts. This of course is not that, nor does it claim to be and I should have read the copy more closely.
Although this is nicely made I am not sure in practice it is significantly cleaner the switching the signed bill for a second folded bill as you insert into the tip jar. That is what I have been doing for years since I was unable to get or make the original gimmick..