Under $1,000: a commercial-style toilet with a pressurized mechanism called Flush-mate, installed by a GC. I have a severely developmentally disabled adult child who… seriously clogged the toilet even without using toilet paper (see bidet recommendations elsewhere on this page) every week or so. I tried 6 different toilets, stationed a wet/dry vac in the living room, added a drain to the bathroom, added a water alarm, etc. etc.

The new toilet never gets clogged. No water alarms now. No cleaning up shitwater. Also while other toilet mechanisms die in a couple of years, this one is guaranteed for 10 years.