For stuff like that that involves a web hybrid component I like to use regular Zope. Not Plone, but you can install Plone and use the Zope in Plone which gets frequent bug fixes.. Zope. its a templating and web dev toolkit written in Python. You can use it to do web-database stuff, and each stock lookup is basically a http get which you can implement as a loop in a web page. Its very easy. And very useful. You can make very simple interfaces to all sorts of hardware.
Its really a personal choice. I prefer Zope, but its similar to PHP where it sits. Its very secure and has very fine grained security features.