1. They are great breeders, but they need conditions. To get the colony to breed like mad, you need pretty good humidity and temps from the mid 80's to mid 90's.
2. "They" dont smell anywhere near the rankness of male mice. And in fact, are in my opinion, infinitly better smelling than crickets.
3. You can order them online. Mikes monitors(link in the monitor forum, then at the site, go to links, then goto death row.) has them, 60 for 40 bucks, all adults. he hooked me up, and I now have between 500 - 1000, in about 6 months. And that was with less than perfect conditions.
4. Unless it is quite warm and humid where you live, they won't be able to propagate outside the colony. They wont get out if you put a descent layer of vaseline at the top of their tub. I would suggest that you watch your animals eat them, to make sure they die. This way, they wont be getting out of your terrariums. As far as what to keep them in, a 22 - 30 gal tote tub is perfect. use pine shavings as substrate to keep away from grain mites. Mist every other night, or when humidity gets low, and feed regularly. Other than that, youll be fine.
One question though, Hissers get quite large as adults, so what will you do with the excess. a terantula will not be able to keep them in check, and unless you have alot of geckos, they wont be able to keep the kids in check. And, if your only going to get a few adults, they only live for two years, and so, you will have to let some babies grow, and hope you get males and females. Just a thought. I mean, if you really think you can control them by controling their environment drastically, i dont think you will have a problem.
Hope i helped.
Truth