I use grapeseed, wheatgerm and sweet almond from www.baseformula.com but they're not the cheapest.
I've used cheap oils in the past and found it a false economy because they either soak in too quickly or at worse go watery after a while. My clients like being able to choose which oil I use on them, and appreciate the quality.
By all means control your costs, but remember the oils you use have direct contact with the client and are absorbed into their skin, and therefore it's part of the chain of care. For that reason I don't cut corners on the quality of my massage oils.
Myarka