I just recently got turned on to RainbowMealworms.com. I placed an order a couple days ago (they are located in California), and they arrived 3 days later (in West Virginia). All of my bugs were alive and healthy.
Here's the link:
Rainbow Mealworms and Crickets
I've been doing tons of reading and talked to lots of gecko people, and here's what I am doing now:
• Crickets - put them in a critter cage and just give them carrots or oranges to sustain on. Skip the water, as long as they have moist fruit or veggies, they'll be okay. Don't ever let the veggies get moldy though (check them every other day). Six hours before my gecko eats them, I take a couple crickets and place them in a cup (w/lid) with Flukers High Calcium cricket food, Flukers Orange Cubes, Flukers Quencher. They pig out on this. Then I dust them right before my gecko eats them. Here's the thing with crickets though...they are very dirty and they stink horribly. They will dirty their critter cage very quickly. NEVER wash the critter cage with soap EVER. Just wash it out with hot water. Soap residual will kill crickets. ALSO, crickets carry parasites that can make your gecko sick. It's very important to keep your cricket cage clean. Don't let it get full of dead crickets and cricket poop. You don't want your gecko sick.
• Dubia roaches - put them in a lid covered container with some cardboard to crawl on. Give them some carrots to sustain themselves. Six hours before my gecko eats them, I take a couple roaches and place them in a cup (w/lid) with Flukers High Calcium cricket food, Flukers Orange Cubes, Flukers Quencher. They pig out on this. You don't need to dust these. They are already rich in calcium.
• Mealworms and superworms - You'd be surprised how a little gecko can eat these big worms. They do! I give these guys some carrots to nibble. Six hours before my gecko eats them, I take a couple worms and place them in a cup (w/lid) with Flukers High Calcium cricket food, Flukers Orange Cubes, Flukers Quencher. They pig out on this. Then I dust them right before my gecko eats them.
• Hornworms - Pretty aqua worms. Just started using these. They actually come with special food in their cup (you can buy more if needed). They grow super fast if they are kept in a warm temp. You have to dust these before feeding them to your gecko.
• Phoenix worms - They come in a cup of dirt. You DO NOT need to feed these bugs AT ALL (pretty cool, huh?). And they do not need to be dusted. They are loaded with calcium naturally. They are kinda small (like a grub). You have to take them out of the cup of dirt they arrive in, before feeding, and let the dirt dry up and fall off them.
All of the above insects that "require" dusting should be dusted with Calcium with D3. That is important. Just dump some in a baggie, put the bug in, and shake the bag. Get yourself some long tweezers next time you go to PetSmart to handle the bugs. You can get them out of the dusting bag easiest with tweezers.
If you decide to put a small dish of calcium in your tank, which some folks do, make sure you buy a different calcium WITHOUT the D3. You don't want your gecko getting too much D3. He should get it only from his dusted insects.
Lastly, if you want your gecko happy, DO NOT leave uneaten bugs in his tank. This will stress him out, and the leftover crickets can bite your pet.
Hope this helps.