Breeding your own roaches is best its easy. In fact the physical effort it takes to breed roaches is less than it takes to buy crickets. In fact it was looking for superior alternatives to crix and mealies for the Green tree monitors that got me started in all this. Basically you want a non glass climbing, fast breeding, non flying roach with some good size to it. There are other feeders also but since you asked about roaches I will stick to that. All the roaches I will discuss are non climbing, prolific, non flying, non infesting species. Hopefully these attachments will work. The first is Blaberus fusca a fast moving prolific roach
The next is Blaberus parabolicus one of the more long lived and prolific members of the genus
then there is the true death head Blaberus craniifer the first shot is so you can see what it looks like the second is next to a ruler
There are others such as Blaptica dubia that are somewhat smaller easy to sex as adults breed well and are easily sexed males are winged as adults females arent.
and for all you size queens out there!
not a roach!