I did a quick search and this was the very first result: http://www.gchydro.com/EYE+Hortilux+...ast+-+HPS.html .

I didn't do any further searching since it's obvious there's plenty of this info available at your fingertips if you step away from the bong for a moment and look for it. :stoned: With a bit of research you can probably find one for $50 - 70.