What are you going to use it for? Ok, that sounded silly. What I mean is, will you be backpacking with it or at a basecamp… or both? Does it have to be 0° or would something rated for colder work? Down or synthetic? Specifics might help you find the right seller.
I have a 2 Nemo sonic 0degree bags. One went to Alaska for moose last year and the other stayed home (took a slick 20 as second bag). Happy to move one of the sonics. Pm if you are interested.
I have a mountain hardware lamina torch 3 degree (its advertised as 0, but says 3 on the tag). Its synyhetic, has a center zip and a baffle that makes it very warm. Ive used it twice in the 4 or 5 hears i have had it. its a little bulky by todays standars, but for a basecamp application it would be fine. Id ask 125 shipped.
I have a North Face Tundra -20° bag I’ve only used a handful of times. I actually bought it when I lived in AK. It is synthetic. I’m not hard up to sell it but I’d ship it for $210. I’d even launder it first. It would come with a storage bag and a compression stuff sack. If you are interested I can weigh it and get some pics.