I have a used pair of Koflach Arctis Expe double plastic mountaineering boots, size 8 for sale. They are used, and have some wear on the lacings and liners, and scuffs on the outside. I bought them used this season but they don't fit, so I've never worn them other than to try them on and I'm hoping to recoup what I paid for them.
Retail price is $429. Asking $200 plus shipping plus I'll throw in a pair of green Superfeet insoles for free.
(Sorry these aren't ultralight by any means, but I figured someone from here might be interested in them. They are great for mountaineering, especially multi-day trips when it's helpful to dry out the liners in your sleeping bag. They can also be used for ice climbing.)