Things to do before Big Bang

At the beginning of BB, SE 20 and 30 were difficult to obtain but not necessarily expensive. The wild hunters came out and they inflated like crazy.
But anywho check out the drop list here and you find out what skillbooks will inflate. Keep in mind what Alex123123 said. Lots of 120s will rise, most wont be able to kill 140+ monsters yet they those are the only monsters that drop certain skills.

Do you know any mobs off the top of your head that are 140+, drop skillbooks, and aren't commonly trained on? Or do most maps become good for training, so it just becomes a matter of levels being important?