This site is like the Rentacoder for article writers. Almost all writers are US based, so the quality of writing is high. Pricing depends on the quality of writer you want – writers are given 2,3,4 or 5 stars – 5 star star writers cost more, but you might get a 4-star writer at the 2-star price depending on availability.
Check it out for yourself: http://www.textbroker.com/
