Amazon sells the 1/16" carving and 1/8" cutting bits for $29.99, but they don't offer the 3/16" Carving Bit. I contacted them and they suggested that I make a request. I did, but perhaps it would help if a few more people did as well.
Use this link or find the 1/16" carving bit on Amazon:
http://www.amazon.com/CarveWright-BC...9956707&sr=8-3
Scroll to nearly the bottom of the page and look for the Feedback box. Find the line
"Is there any other feedback you would like to provide? Click here "
Click and enter a request, e.g "Please offer the Carvetight 3/16" Carving Bit for sale in your store."