If you live in the East half of the US, I recommend premiumcrickets.com
I use two cheap totes from walmart to keep them in. For one, I cut a large hole out of the lide and duct-taped screen over it. That's where I keep the crickets - with cricket water, cricket food or greens/veggies, and toilet paper/paper towel tubes/egg crates for them to inhabit. The second tote is kept clean and empty - I put my dragon on one side and shake a good 20 or so crickets on the other side. He eats until he's full OR until it's been 10-15 minutes. Whichever comes first. Then he goes back into his viv to bask, I dump the crickets back into their tote, brush out the other one, and done.
Good luck and let me know if you have any questions.