Hi djrickyb,
If you purchased a custom domain for your Auctiva store, your new Auctiva store URL should be whichever domain you selected during the purchase process. You should be able to find the custom Auctiva store domain you purchased by clicking the "Store Domains" link under the "Store" tab within your account and looking in the "Your Domains" section.
Any additional questions or concerns? Please feel free to contact our customer support team by completing the web form on the following page of our site:
http://www.auctiva.com/help/requesthelp.aspx-Mike