Brand spankin new black Sidi Mag-1 boots, size 42 euro/8.5 us...although I’m a size 10 and these fit just right. I put them on and wore them around the house for an afternoon, that’s it. $300 shipped.
That's strange that your sz. 10 can fit these. I have the same boot in the same size, and I always wear a 42 EU (9 US). It took some breaking in before I could wear these boots without it hurting my lateral toe bone on my medium-width feet.