There was an earlier white text RGB set from a group buy run by aggiejy. They use the standard SP font though, as opposed to the Cherry replica font used by mbc's and my sets.
The aggiejy sets are typically $20 or $25, though they don't come up for sale very often any more. I imagine posting a WTB thread would turn some up.
The Cherry replica RGBYs are usually more. $30-$35 or even $40 is typical, I'd say.