I read that it was 50% off of Mactusk, but I kind of doubt that. I must have killed him close to 10 times by now and no tooth :( Then again, I could simply be incredibly unlucky.

edit : nvm got it! :D

lol glad u finally got it! :D

if some items never drop, make sure you update the game manually if you can. becuz it's probably a glitch. I did a lot of spelunking--going into caves-- and Slurtles never dropped anything when I killed them. :( As soon as I used the manual updater, it fixed this bug.

hope this helps. have fun!