Groupon offers the FreshSpa Bidet Toilet Attachment (pictured) for $39.99 with free shipping. That's $5 undr our November mention and the lowest total price we could find by $9. It features a self-cleaning retractable nozzle with three positions and adjustable water pressure.
Of note, Groupon also offers the CleanSpa Luxury HandHeld Bidet for $44.99 with free shipping. That's tied with our September mention and the lowest total price we could find by $20. This handheld sprayer clips to the side of the toilet.