Thank you for your response!
I tried to do this in the demo. It worked at first, but I think the demo reset, and I tried to do it again and it didn't work. The price went to $0, but it didn't say free, it said $0.00 and you could still add it to the cart. I did go into the configuration and change the "Display 'add to cart' button for free products" set to "No".
Also, when an unregistered user is placing an order, is it possible when they are submitting their address to have the button say "submit" rather than "register". I would like for customers to be able to ordering without any registration at all, so that there is a clear distinction between an unregistered guest who can purchase a limited number of items, and a registered guest with a "special account" who can order anything, including the hazardous chemicals.
Thanks, I appreciate it!
-Wayde