I just bought this thing for 35k on Quetzalcoatl. Price wasn't bad, it was just never in stock.
It's a decent upgrade from my Seer's Tunic, but I'm hanging on to that so I can switch back and forth. That +1 MP regen while healing really helps. But so will the extra INT from this robe.
This seems to be the +1 version of a crafted Velvet Robe. Same equip icon, with the background that comes with +1 items. I'd suggest scouring the AH in Jueno, or maybe working on getting clothcraft up to the level needed for Velvet Robe.
Either way, it's going to be expensive. Good luck!