Thanks to the USPS making some serious changes and impacting the way out website works, we will be starting a major website re-design tomorrow. It may take quite some time, but expect to see some major changes in the near future to our website.
In the meantime, shipping quotes for orders under $100 are not working properly, so we added a kind of flat rate option for this for the time being. Sorry for all of the problems. The USPS changed the way the do Priority and Express mail as of today (as well as raising the prices a bit).
Sorry for any trouble in the meantime.