Anker's Eufy RoboVac 11 is on sale on Amazon for $176 [amazon.com]
. This was the introductory price when it was released about a month ago, and I bought one.
I also have a Neato, and I have had a Roomba in the past, and the Eufy is among the best I've tried. It has a Lithium-Ion battery, which very few budget robovacs have, as well as a remote control and an auto-dock feature.
The "list price" of $500 isn't accurate, but this did go up to $240 after its initial sale, so this is a pretty good deal.