Your default shipping country still appears to be United States. If you were testing a cart and had selected a different country, that would persist in your cart for 24 hours, as each buyer's cart contents and in-cart selections persist until checkout or for 24 hours from the last time they viewed their cart, whichever happens first.
I had a look at your page, and the problem seems to be a conflict between our cart script and the last block of javascript in your page. I made a copy of your page source and was able to get the cart working normally again in my copy by removing these lines:
<script type="text/javascript">
try {
var vglnk_api_key = "d7db31b5bc5f7c8ff840b57ee4e2df68";
var vglnk_domain = (("https:" == document.location.protocol) ? "https://" : "http://") + "api.viglink.com";
document.write(unescape("%3Cscript src='http://www.weebly.com/lnk.js?key=" + vglnkapi_key + "' type='text/javascript'%3E%3C/script%3E"));
} catch(err) { }
</script>
<script type="text/javascript">
try {
vglnk(vglnk_domain, vglnk_api_key);
} catch(e) { }
</script>
It appears to be loading a larger script file from the script provider's server, so if you didn't recently add those lines to your site, the provider of that script may have recently changed something about their remote script which started causing the problem.
I tried moving that section around to different places in my copy of your page source, but only deleting it entirely solved the problem. You can either remove it from your site, or if you want to keep using whatever function that script performs, you may want to contact that script's provider to see if they'd be willing to edit their script or suggest a workaround.
