BioBidet via Amazon offers Prime members its Bio Bidet Duo Hot/Cold Bidet Attachment, model no. BB-270, for $38 with free shipping. (Non-members can spend $49 or more to qualify for free shipping. Otherwise, shipping adds $13.83.) That's $4 under our June mention, the best deal now by $12, and the lowest price we've seen. This non-electrical bidet doesn't require any bathroom modifications and features pressure and temperature control dials, installation hardware, and self-cleaning nozzle.
A close price: Walmart has it for $38.99 with in-store pickup.