You may need to change you shipping address type from “Business” to Residential” (This is caused by an issue in the shopping cart and will not affect your shipping cost)
To do this, at the beginning of the checkout process choose “Edit address” under “Shipping Address/Method” then choose “Enter a new shipping address”. Choose “Residential” in the “Address type” field then click the “Use this address” button.
You should be able to check out now. If you continue to have problems please let me know.