I was getting questions on this so I wanted to post a quick update.
Auctiva Commerce, the new webstore offering from Auctiva (formerly known for their eBay third party services) is opened its doors to BETA users on January 20th. If you aren’t already signed up to be a Beta tester, there is a sign up on http://www.auctivacommerce.com. As to when it will be open to the public, all they are saying so far is January 2009.
As for pricing, it looks like it starts at just $9.95 a month which makes them cheaper than a lot of other places so it may be worth checking out.