The blower you have is a Cub Cadet 551 blower. Below is a link to the partstree site that shows the machines the blower is compatible with. You have a very nice blower there (although it could use some paint) but I do feel your price is a bit high. I don't know what they go for in you area but I've picked up a 451 twice now (the previous generation of your blower), one for $400 and one for $250 so prices can vary depending on who has it and if they know what it is. Good lucking finding a nice home for your blower
Edit: Someone correct me if I'm wrong, but isn't that blower 45" and not 48"?
http://www.partstree.com/parts/?lc=cub+cadet&mn=551