Ixali Camps north and sorrounding Treespeak. Start at Emerald moss and go north.
Ixali Camp south west of Camp Glory.
Raptors east and also west of Camp Iron Lake.
All of these mobs spawn between 40-49. I have not seen for myself how a 35-40 party fairs at these camps post-patch. I think a full party will still do well there. Pre-patch these camps worked from 28-42.