I'd say you paid a fair price. I would say the current average price for a complete one would be between 100-150 dollar depending on condition (i.e. has it been sharpened, are the scales cracked or damaged, etc)
I have seen just the scabbards only pop up on eBay every once and a while in the 40-60 dollar range.
What I'd like to know is what type of frog was correct for these bayonets? I seem to recall reading that Enfield 1907 frogs and k98/vz24 frogs were used, although I've never seen any photos to legitimize it.