I don't usually like to endorse on here, but figured it might help someone out. CarFanatic, I know HobbyTown has OD SpeedBlend in stock, we got a bunch of it a month or two ago. I don't know if there is 30% or not as it isn't the fuel I run, but you may want to give a quick phone call if you're really needing some.
Again, I try to leave my racing half and my work half seperate, but figured since you were looking it might help you out.