We have carbon rigid Boost 110 front forks in both 27.5+ and 29+ which we sell for $420 apiece. We get these with our Boost hardtail frames but since many of those customers have us build with a suspension fork we have some extra forks we do sell, mostly to Trek Stache owners. Pictured on the left below is the 29+ version with 500mm A2C and on the right the 27.5+ version with 492mm A2C. Both are tapered steerer tubes, and include the QR thru-axles which are 15x110. Both forks are 51mm offset.
But here's the deal: these forks are great and we have never had one fail, but if you're planning on catching big air and riding this fork like a suspension fork on your mountain bike we don't want you to break your face and sue us. So any buyer/rider of this fork must sign our waiver (shown below) releasing us from any possible legal claims. This is not a suspension fork don't go catching massive air on it and get hurt please!
29+ fork: 740g including axle 27.5+ fork: 770g including axle