I just started using Roaches. I got mine from www.holygrailgeckos.com under the feeders list. They are about the cheapest I could find with shipping. Might try breeding some roaches myself in summer.
What I did was get the 100 watt ceramic emitter and use the zoo med fixture that has the dimmer switch on it and dialed it down to the right temp. Seemed to work fine.
Is there a certain age you can start feeding them with it? Would you use it at every feeding or just a couple times a week that's if you dust your crickets with it.