I would definitely invest in some dubia roches. If you can get yourself a colony going, it will be a great way to save money and provide a very nutritious food source for your frog. One adult female dubia can produce 20-40 babies a month. This way you can also ensure that your frog is getting the most nutritious diet. A lot of pet stores just offer their crickets potatoes, and so in turn, that's what your animal gets. If you have your own roach colony, you can gut load them with carrots, apples, and some high protein cat food.
If you decide not to do the colony and just stick with the crickets and worms, you are certainly not getting the best deal with those crickets. We get 1000 for $12. I would suggest talking with your local pet store and seeing if you could have them order you some in bulk.
This way you can cut back on the mouse feeding!! Too much protein and fatty tissue build up can result in a froggys life cut short! Lily's too pretty to leave too soon!