Something I always did if I did not have the cash for anything is took a high level toon of mine and went and cleared out Phinegal Autropos for his +15 STA +100Mana robe, and when you're done with it, you can MQ it for a rogues epic. It's easy to get 3-4 kills maximum, and you can wear it at level one. It can be camped by almost all level 75's, but I won't say all because someone could just be that bad. I did Phinny with a few classes solo; 70 Wizard, 70 Mage, 70 Druid, 70 Bard, 70 Monk, 65 Magician, and I think a few other iffy classes. If a cloth caster can do it, you can do it!
If wanted, you could camp a simple +6 Int aug from a zone or something and put that in it, cause then you would get some more mana out of it. Good luck though, hopefully you get something.