If you want/could you could breed them, all it takes is a 60 quart tub, greens for food, maybe a wet paper towel for extra water, egg crates or paper towel tubes empty, 75-80 temperatures, air holes on the lid or top sides and then 5 females and 1 male if thats all you can find. Though 25 females and 2 males would be better. And then just make sure their fed good and cared for and then they eventually will produce babies and in the warmer seasons just buy a few more when you can, keep adding to the colony to make it larger. And then feed off the medium sized ones or if you have to many adult males feed off those once the colony is a good size.
Though crickets would be the next easy thing, i'd say get two tubs 60 quart and 90 quart and some egg crates. 60 quarts for a smaller size of cricket and then 90 quarts for medium/large. Give them some collard greens or any healthy greens and they should be good to go but of course harder to breed than dubias if you wanted to do that.