I couldn't find anything. It's most likely because MOST injectable dbol will use guiacol while prop will not (just ba, bb, and carrier). That and just popping a pill or dosing from an oral syringe is so ridiculously quick and easy it seems like a waste to make a niche sort of product like that.
It'd be difficult to adjust either hormone's dosage in a healthy/safe way. Imagine a 1:1 ratio where you want to get 700 test/wk... You'll also get 700 dbol. You'd have to purchase extra test just to stay at a reasonable dbol dosage.