Hi Ben,
Thanks for posting your question here. Ebay used to offer a special format of listing called a "store inventory" item which was only available to sellers with eBay store subscriptions. However, they have since done away with that listing format and now just give store subscribers discounts on fixed price listing insertion fees based on their level of store subscription.
The issue of the "Store Items" link still being available in Auctiva.com stores is a known issue that we plan on correcting with a future update of our software, although I'm not quite sure when that will happen at this time.
Unfortunately, it is expected that clicking this link would direct viewers to a message that says no items are available because that format of listing technically does not exist any longer.
Sorry about the confusion, but I hope this clears up what is going on. If you need any further assistance with your account, please feel free to let us know by mousing over the "My Account" tab within your account and selecting the "File Support Case" option.
-Mike