CB price field with decimal

I wondering if is possible to set a simple Text or Integer field (who will be used for add a price value) with decimal. For example I would like set the field for contain only numeric value + dot. In practice if a user want set a price such "12" he can do that at least in 3 way:

1) 12
2) 12.-
3 12.00

So what I would like is to format each price value with decimal such 12.00 even if user introduced 12 or 12.-. Now of course if user set his price such 12.50 no problem in this case.

Any solution for that ? An alternative is to warn user with a tooltip comment and say they must always set their price with decimal but they can forget or just don't care.

You could use custom regex validation to enforce a format like that. Alternative is to output the field using a delimiter and use IF substitutions to determine if decimals should be added or not.