Why don't you just breed woodies instead? I have a small colony going in a tupperware container and that's enough to keep my ackie monitor going. Started off with two boxes of large ones, and now only have to top up with a new box of woodies every few months (Even less often for you if you're only feeding a gecko). They're much easier to breed than crickets, and have smaller heads (i.e. less chance of impaction). You'll also have a range of sizes in your colony, which you can feed to your gecko as it grows. I mainly feed mine vegetable peel/scraps and dry cat food to gutload them, no need to have any standing water (they get water from their food). They're really very undemanding. The trick I find is to keep the colony DRY. Too much moisture is a REAL problem for them. The only problem is that they can climb pretty much anything, so you'll have to make sure your gecko eats everything, or that you have a very tightly sealed enclosure.