Walmart offers the iRobot Roomba 880 Vacuum Cleaning Robot for $415.22. Opt for in-store pickup to drop it to $405.67. That's the lowest price we could find by $19 (most charge over $500), although we saw it for $23 less during Black Friday. Features include the AeroForce performance cleaning system, tangle-free AeroForce extractors, HEPA-filtered bin, and XLife battery.