getting bones is kinda like we used to buy regs. Go to the mystics in Ter-Mur, park a char on a second account, buy all they have, then go play on your main acct until they respawn. rinse and repeat. I bribe them all up to barbed for the increased turnin points, and yes, a bigger pain than a regular or studded, but still worth the effort.
The shadow wisps at the Spirituality champ spawn in Ilshenar are a good source for bones. Other good sources for bones are the effete putrid gargoyles and effete undead gargoyles that spawn in the Royal City in Ter Mur every two hours for about twenty minutes (i.e., between 7:00 p.m. and 1:00 a.m. according to the in-game clock when in Ter Mur). Unless you're up for a fight, watch out for and avoid the one putrid undead gargoyle that spawns with them. He's a darker red color and can usually be found on the road between the buildings that face east or west. You won't usually find him hanging out at either the north or south ends of the spawn or behind the buildings.