I'm surprised no one has posted about the Snozocchi yet:
Brad Bingham?s Snozocchi Fat-bike Suspension Fork | FAT-BIKE.COM
Looks pretty sweet, this guy is making new crown and bridge for older Marzocchi forks. At $1150 complete / $750 kit (provide your own fork donor), it is a little steep for me right now, but I like it! Hopefully I will be able to swing one this summer.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Suspension Forks