Stampors - You can find this spawn in muggy plains and farm the creature products for the mount. Depending on your server it could cost 15-20k
Brimstone Bugs - This is a small spawn but Brimstone Fangs (8k) are a good creature product to farm.
Forbbiden temple - this is "Tzumrah the dazzler" (nemesis boss) spawn so here you will get several charm points AND you will farm Cultish Masks (6-10k)
This is a huge spawn and you can farm "Incantation notes" (15k)
The prices i mentioned here were taken from my server, yellow open pvp.