iRobot via eBay has iRobot Roomba j7+ Self-Emptying Robot Vacuum (Certified Refurbished w/ 2-Year Allstate Warranty) on sale for $279.99 when you apply coupon code TOPSELLER15 at checkout. Shipping is free.

Certified – Refurbished:

• eBay has verified that this item has been inspected, tested, cleaned and disinfected by a qualified refurbisher
  • Appearance: Pristine, like-new condition.
  • Performance: Works like new, meets the manufacturer's specifications.
  • Warranty: Two-year warranty serviced by Allstate.
  • Packaging: Comes in new, generic packaging with original or new accessories (if applicable).

About this product:

• Avoids common obstacles like socks, shoes, and pet waste
• Edge-sweeping brush
• Empties itself for 60 days
• Smart mapping
• Works with Alexa