I get URI bulbs locally for about $26-$28. (48 inch 110 watt)
When you are buying your Icecap-- see if they can send you one that is allready fitted for the dimmer.... the company will install one for free, but you have to send it to them. I bought one with the dimmer plug allready built in-- that way down the road, when you are ready to put another $200 into your setup, you can buy a dimmer control for it, and not have to have it retrofited for one.