Bravo props come in even sizes, 22-36.....Mirage 3 blades are odd, 19-29....the Rev-4 comes in odd numbers though, and I'm pretty sure it comes in a 21 (I know it comes in a 23 and 25). Is that the prop you are looking for?
Call York or Hill, both are in Orange County.
EDIT - The Revolution 4 comes odd, 17-25.
RTJas