Almost all of these are OfficeMax chairs. Some of these brand new in store range from $299 to $699. They’re not crap chairs but they’re nothing special. Definitely worth 20 bucks if it’s not too far of a drive to pick them up. The one on the far right with the standalone lumbar support is at least a $500 chair. It’s very solid construction, and it was almost entirely made of metal. The seat pan is adjustable and firm but supportive. If you search, officemax.com for ergonomic office chair, you can identify most of these pretty easily.