Well, somebody has to say this, so I might as well:
you can't legally sell products made from a copyrighted pattern unless you get permission from the designer/author.
The clogs were designed by Bev Galeskas. You should be able to reach her at fibertrends.com, or by mail at Fiber Trends, Box 7266, East Wenatchee, WA 98802.
If you do get permission, your prices sound on target to me.