If you order crickets in bulk make sure you have a large container to store them in. A large rubbermaid type container is ideal. Just cut some large openings in the lid and cover with screen (same type of screen you use for windows, just make sure to get the metal screen as crickets can chew through the fibreglass or vinyl screen). Or if you don't want to cut large sections out of the lid, you can instead drill a whole lot of small holes with a drill or rotery tool using a 1/16 of an inch drill bit.
That done, just use alot of egg cartons (you can probably buy teh large egg flats at any poultry farmer supply store, or alternatively check with your nearest restaurant or school cafetaria and ask if they will hold the egg cartons for you. You don't need a huge amount but should get about 2 large flats or 4 regular egg cartons. Take these and tear them up into sections and toss them losely into the rubbermaid container. Make sure they are not so high that the cricket can jump out easily when you open up the container. Don't worry about putting anything on the bottom of the container, don't really need it and it just makes it more work to clean the container.
To feed the crickets you can do one of two things. Buy cricket gutload from the petstore or make your own. One recipe I found on Bill Mears website (www.geocities.com/borderviewdragons) is very good. I would use that instead of buying gutload. It lasts alot longer and is cheaper by far. Just put this into a shadow dish (the lids off Hagan Daaz 1/2 litre icecream are great for this) and place it in the container. In addition, take another lid, fill it with chopped mixed grens (yep the same you give your dragon) with some carrto chunks, or potatos or slices of oranges for moisture. Change this dish every day but the dry stuff should be good for a few days, unless y ou notice alot of cricket poo in it.
That's it for caring for crickets.