I just had this feeling you did live in the northwest coastal area. In your area that is not an uncommon price for a pullet.
Out here, I would be laughed at and never sell a bird. I wouldn't pay that either - unless it was a breed/line I was interested in continuing through my own breeding. That doesn't mean it isn't right for you.
Because you are new to chickens, and because you only want a few birds of specific breed this could be a reasonable price for you. It allows you to skip weeks of work and waiting to begin with a bird that is healthy and ready to lay. That said, you need to be sure this bird IS healthy and well kept or the price is too high.
There are a lot of BYC members on this forum, you could try a wanted ad. Craigslist is an excellent resource as well, but you need to know what you are looking for as far as living conditions the birds are in and condition of the bird, or you may just buy trouble.
Remember any new bird needs to kept away from your current bird for several weeks and runs the risk of being a disease carrier.
PS
How to search Craigslist more efficiently: Go to
http://craiglook.com/ and put in the key word "pullet" or "hen" and your zip code. Then you can adjust for how far you are willing to drive.