I would avoid hissers and lobsters as everyone else recommended for a few reasons. For starters, they both can climb and very well at that. So you must make provisions for both the container you keep them in and also either feeding cups or the containers for the animals you keep. Your choices here are a fluon product so as bug barricade (stop) whatever; it's all fluon or vaseline which is just messy. Also, hissers get to large for what you will use them for which can also be a bonus. Once they get past a certain size, they can be left to go on as breeders. Lobsters are the perfect size and are probably the most prolific but they can climb extremely well which is a hassle. Both are very cheap which is a bonus but I think you would be better off in the long run if you went with one of the species of Eublaberus or Blaberus as they all have numerous benefits over the other aforementioned types. Your best bet, if you can find them, would be Blaberus dubia as they don't get much larger then a lobster and they are super prolific. My next recommendation would be Blaberus craniifer. They get larger then the dubia but you will find that tokays can tear apart a large adult so one roach would actually make a meal. They are somewhat easier to find as well. James Tuttle who usually frequents this forum offers the dubia (craniifer also I believe) for sale from time to time when he has excess. I actually got my initial dubia from him in a trade.
We have a couple species that can't climb for sale at this time. I'm not trying to use this as a sales pitch either, just stating some facts from my experience as we started with lobsters and hissers (still have them as a matter of fact) but we are weeding them out to concentrate on the non climbers.
Check out our website if you wish as we have some detailed care sheets on some of the commonly kept specimens.
Feel free to email me if you have any further questions, I don't check here often so that is the best way to reach me.
I hope this helped you some! I would definitely give the roaches a try, we haven't looked back at crickets since we got our colonies established!!!
-Just Bugs Staff

::Just Bugs: - ::We will never stop buggin' you!!::