This was an auction that was listed for 500 dollars plus 150 dollar shipping charge, i bid on it on the last 30 seconds left and got it. After taxes and all it ended up being 700 bucks. If you are going to buy one just triple check that they say its in good working order, there are a lot of vendors that say their freezer only goes up to -70c which is most likely saying that their freezer is probably on the way out, according to sterling a ult25neu should go from 25c to -86c empty in around 4 hours, i low balled the hell out of this seller:
https://www.ebay.com/itm/1867097121...Dumg4pfTU2&var=&widget_ver=artemis&media=COPY
He sent me an offer for 600 dollars, but if you see the post it says -70c so when i asked him about it he says he had it on for over 12 hours and would not go below -70c so i declined purchasing it. Try to low ball the ones that are good condition, they typically do not see a big volume of sales so they are going to be more willing to get rid of them for a lower price.