Roaches are supposed to live a very long time compared to crickets, that would be good if they last a good long while and really don't stink. The herp shop wants anywhere from $0.50 to $3 each for hissers at that rate my pets would be eating higher priced meals than me sometimes! lol
I've been You Tubin it up tonight searching "roach colony" videos, seems the dubias are the #1 feeders but they all seem to be kept about the same. High protein dry cat food or dog biscuits, water crystals and fruits/veggies high temps 90*F+ for breeding activity and vertical cardboard eggcrate for housing. I got my colony box built today, now I'm waiting on my eggcrates and water crystals and of course, the box full of nightmares!
If you need water crystals for roaches, crickets, etc get the dry crystals and add your own water, way cheaper don't buy a teaspoon of crystals and quart of water from petsmart for $10 buy a 2 lb bag of dry crystals and have enough for god knows how long: http://www.watersorb.com/prices.htm