See bottom of post for update.
Frye's Melissa button boots retail for $302 at Zappos and comes in several color options.
If the originals are out of your price range at the moment, Wanted has a great alternative that retails for $80 at Piperlime. Click on the photo below to purchase, or click here to purchase these boots at Endless for $79.99 and they also have them in the cognac color).
*Update - 11/9/10* - This post is originally from December 2009, so the Wanted version of these boots are almost completely sold out. If you are still looking for an alternative to the Frye Melissa boots, you're in luck! I just spotted these Kasia boots from Target, which are a fantastic option for less. They retail for $59.99 and you can click on the photo below to purchase.