I'll throw in my two cents for Ms T's Bakery. I tried many different vendors and wasn't happy with them, even when they offered an extra flavor option - I got no flavor. I was disappointed when I e-mailed Ms T and asked if I could get extra flavor and she told me no, they don't offer that. I ordered some small bottles and found they didn't need to offer it. I've ordered exclusively from there ever since.
Most people seem to like her Snickerdoodle Cookie flavor, and it is good, but my favorite is Apple Pie. Or Banana Nut Bread. It's a tie, I guess.