I am one who fixed my toilet for the same reason - if its fixable, removing the toilet will not help much - use a coathanger to clean the "track" - otherwise, at least as of last year, the part is available for about $85.00 from marksrv.com - great folks to work with. In my view, I fixed mine rather than having to figure out how to fit a new one in.
1956 Flying Cloud
Four Corners Unit
Albuquerque National Balloon Fiesta
Vintage Trailer Academy - Formerly the original