Hi, about four years ago I was selling refurbished oxygen concentrators to Lampwork artists on ebay. I am now looking to start selling concentrators again, but ebay no longer allows concentrators to be listed. So I thought I would start a thread on here to see if anyone is in need of a refurbished oxygen concentrator, or needs theirs repaired. I would look forward to servicing you and can be contacted at stottsinc@gmail.com. Rebuilt and Refurbished units start at $400 plus shipping and carry a 1 year warranty. Thanks