On his Facebook page, or his eBay store. Jimmy is a member here, he'll chime in when he sees new action on this thread. Just look up Jimmy Tarps on Facebook. He's good about getting back to you pretty quick if you message him on there.
Anyone on here running a Granite mountain setup? I am thinking about picking one up with the vestibule attachment, and one of his summit bivy's. Just looking for firsthand experience.
Just received mine. Looks pretty sweet with awesome craftsmanship. Gonna seam seal it this weekend. My ultralight sleep system is weighing under 3 lbs 12oz. Which is less than my one man tent. Pretty thrilled for turkey season in Nor Cal!