Stolen from Wild Karakul or Marids.
Even with Steal +11 i needed about 3 hours to get a stack in my fastest and about 7 hours in my slowest try.
@ Kirana: so that makes me a RMT too, when i sell that for 150k a stack? Thats is the silliest thing i have ever heard. Crafters make a ton of Gil with Wool Grease. I make money by farming these.
Steal these from Marids in Wajaom Woodlands (there's a camp at xx that has 4 that respawn quickly). So far, have not noticed much difference with +steal gear, generally get about 2-6 per hour.
Combine this with vendoring Marid Tusks, Marid Hides and you've got a pretty consistent/profitable farming spot.