Hi,
Thanks for letting me know, this was a bug in the ms sql version. My testing in MySql has been more extensive because thats what this site uses so I had not noticed this bug. If you are working with the code from svn trunk, you can do svn update, then visit /Setup/Default.aspx and it will run sql scripts to fix it.
The basic thing to know is products are not sold directly but through offers, so you define a product, then you define an offer and add product(s) to it and set the price.
This feature currently should be considered experimental.
Best,
Joe