I just go to e-bay and search for "refurbished lenovo thinkpad (model I want)" and look for sellers that have good ratings with the buy it now filter on because I don't have patience for bidding. If they have a warranty it should be fairly prominently featured on the page. Last time I got a 3rd gen touchscreen L14 for like $300 and it came with a 2 year warranty, runs Mint like a champ!