check out theroachguy.com - ian haggerty- hes a great guy and knows a lot. We just got a bunch of roaches from him, and their great- we havent fed any to our beardie yet- gonna wait till the females start having babies- but im sure he can and will answer any questions you have about them. also if you havent yet checked out beardeddragon.org then you deff should, plenty of roach info there also!

good luck