Don't know what she charges, but I've enjoyed my time spent in Bonnie Hunter's (of Quiltville) workshops and lectures. She's in NC and travels most weeks out of the year. I think she's booked into 2012 already.
http://www.quiltville.com
edited: she's now booking 2014!!! So she may be too popular for you to start out with unless you want to wait a few years!