Ramona said..
This is what your looking for. http://www.asap-supplies.com/marine/brass-cased-shaft-bearings-for-imperial-propshafts. The usual thing is to buy on shaft size and larger than the outside diameter and turn it down to suit. Its only 5 minutes in a lathe and you should have some pensioners there with a lathe busting for something to do. Either brass casing or 'glass or straight plastic/rubber. $250 is a little over the top!
That link is not working but I think this one will.
www.asap-supplies.com/Edit:- Yep it is working for me.