If you are looking for the OEM backrest...
Check eBay, they're always there.
Check out Honda of Russellville, they are a site sponsor.
If you want to look a little closer, take a look at Honda East just north of you in Maumee usually has them on eBay.
Honda of Troy is another dealer to look at.
Search for these two items:
BACKREST (08R71-MJG-671ZA)
MOUNTING BRACKETS (08L73-MJG-670ZB)