I can't say enough about this great site, Mountain Rose Herbs. I mostly get their bulk dried herbs, but I am sure their oils, etc. are just as wonderful. They have far better prices than elsewhere on most items, everything is organically grown, and their herbs are 100 times fresher than what I see in the bulk bins in my local health food store. So I would trust their carrier oils and butters also.

The only negative is that if you live on the east coast, shipping gets pretty expensive. But it's worth it!

Sorry to sound like an advertisement...no I am not affiliated with them :)

Here is a link that might be useful: Mountain Rose Herbs

or you can try soaping supply stores, they sell the stuff in bulk at considerably cheaper prices than stores.

Here is a link that might be useful: To Die For Soaping Supplies