Cindy -
What part of the toilet went belly-up? A lot of things can be fixed.
If the upper housing cracked where the seat comes down on it, it can be welded by a plastics house - several of us have done it, and you can find the stories using the Search tool.
If the seal on the drain at the bottom of the toilet won't seal any more, a replacement seal kit is easy to come by. Again, use the Search tool.
If the pump no longer whirs, and you have confirmed that the switch and the toilet's internal fuse are good, then I am guessing that a replacement pump can be had, either from Thetford, one of our members here, or an RV Salvage outfit (there are many).
If the pump whirs, but delivers only a little water, then the delivery hose has come off, and is easily replaced. Again, the Search tool ...
Every once in a while (including recently), one of our members removes the toilet from his TM and offers it for sale. Watch the Parts for Sale Forum.
I don't know of another recirc toilet that can be substituted. Several of our members have substituted a cassette troilet, but it is no less expensive.
Good luck!
Bill
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