I assume you mean wet gutload? Well, if you're getting tired of buying bags of greens that go bad after 3 days you can always turn to the bags of frozen veggies at your supermarket. Stuff like carrots last and last, but other veggies you can probbaly find frozen in packets, so you remove what you need to thaw and put the rest back in the freezer.
My dubias love mango, they go nuts for it, but since it's not a great gutload to be fed off to the chams, I only feed them a little bit every once in a while. So I have bags of frozen mango chunks that I feed from to last me longer. So you can see if that's an alternative you can use, at least with some wet gutoad options.