Have you checked with any of the local dealers to see if they have a used one available? I bought a used one from a dealer in NH and the year before I found a used one at another NH dealer. Both of these came with traded tractors but were sold separately from the tractors. The difficult part to find is the quick hitch since the same hitch is used for the snowplow also. If you get a lot of snow where you live, I would suggest that you look for a BX2822 blower since it is a 55" wide blower vs. the 48" chain-driven blower.
If you don't care about having the latest and greatest snowblower, and you can find an older one, it will work on your BX23S if you remove the grille guard. I have a spare chain drive snowblower that will fit the BX23S, however, I don't have a spare mounting system presently.