I am currently TS 289 (without trophy) at Jewelcrafting and just bought and scribed this scroll from Jewler Nonnie in PoK (in Doggle bank) for 8pp 3gold 9silver and 9 copper ..fyi
I'm not sure of JC level requirement, but my JC skill is at 293, and I can't get it either. I think it might be based on the level of your trophy also. Mine is at 5/7 and I can't get this one along with the exalted or sublime. They just don't show up on vendor.