You don’t often have a chance to see actual prices from actual creative freelancers. It’s something most keep pretty close to their chest.
One exception is Ed Gandia, B2B Copywriter specializing in technology (who also spoke at CFC 2012 in Boston).
Amazingly, Ed is giving away his rate sheet (on this page) — you see actual rates for 32 commercial/B2B writing projects + strategies to boot!
So whether you hire copywriters or are a copywriter yourself, this will give you a good idea of how a professional copywriter prices his services.
You can find similar information (and much more) in the latest edition of the popular resource, The Graphic Artists Guild’s Handbook of Pricing and Ethical Guidelines.