yeah, the hissers in the petshops can run you about ten dollars, that (in my opinion) is assanine! We got our batch of 12 donated and not sexed. If you think about how many animals we feed the bugs to (geckos, monitors, tarantulas and so on) you can just imagine how prolific they are! We feed them off all the time, including the adults to the monitors and they still grow up fast and make lots o' babies!
they do climb the glass so you have to put a ring of bike grease around the top rim of the tank. But they do eat all the stumps and left over vegies from our veggie eaters bowls, so It's a nice "garbage disposal" system.
Yeah, I have heard (I think I saw them online) of different species that don't climb, those would be what we would be most interested in.
Thanks
Rusty