Might consider lake starfall goblins that drop 2-5pp per which can add up early on, as well as gsm wraiths in the 45-60 range that can drop up to 9pp ea as well as essence that sells for 2pp each.
You can start on those wraiths earlier than that, even solo. My wizzie started on them at 36 iirc, and a bard friend at right around that point. They are almost all red at that point, put at 37 you start seeing more yellows. By 39, you'll see it range from blue to red.
Frosthorn animals are good for the exp and quest turn in items. From probably around 35 to 45-ish. And with all that gnoll faction built up, you can then pick them off slowly and ruin it.
Late 30's and 40's, go to heartlands also. If the robots are camped, you can always go to the goblin cave. Other than the frenzy, they are fun to fight. Just make certain your healer(s) are awake.
Great Divide animals near the harthuks caves are good for the 40's, also.
Though really, everyone and their brother/sister goes to Robots in the 40's anyways.
As for the 20's, besides the drakes in GSM, you can gather up the wandering goblins down by the docks and slay them. Especially good for bard ae kiting.