Good advice you've gotten so far. I wholeheartedly agree with Ebay & Dixie. Dixie is my friend! LOL!

They do have the best prices on a lot of supplies, & it's worth saving up a bit to get that free shipping.
I agree, don't just get the cheapest brush you can find. Get one that's comfortable in YOUR hands & is versatile enough to use with a variety of paints. However, YOUR best brush may not be the most expensive one, either. I painted for 15 years with a set of old & abused Paasche VL3 brushes (all covered in teflon tape) before I finally got something "higher ended". A lot of the subtleties that make some of the more expensive brushes so great & so responsive are best appreciated when you have more experience. If I'd picked up my Iwata HP-BC or my modified Richpen Mojo when I first started, I honestly don't think it would've made a whole lot of difference in the quality of my work. But that's just my opinion.
Good luck!