Food & supplies
Ed's Fly Meat - I culture my own flies, but if ever I need new cultures, I get them here. Very good prices. They are based in WA.
Jerry Tresser - I can't count how many times I have had to run to Jerry for emergency flies. If you ONLY need flies, this is the place to go. He sells bulk fruitflies, 300 flies for $3 plus shipping. I offer the same, but I am not always stocked. If I am all out, definitely give Jerry a call.
Spider Pharm - This is where I buy my housefly pupae. The owner is always willing to answer any questions, and will also explain how to raise your own, although I do not plan to EVER raise my own houseflies. At least, not until the flightless houseflies are more readily available. I think I will let him deal with the maggots for now. They are based in AZ.
Vados Bait Shop - I go here for spikes (bluebottle fly larvae). I allow them to pupate and emerge as adult flies which I feed to the mantids. They are based in MN.
Sunshine Mealworms - I go here to buy superworms, mealworms, crickets, and occasionally waxworms. I do not recommend feeding waxworms or waxmoths to mantids too often though, as they are very high in fat. They are based in OR.
Mantid Forum - This is the mother of all mantid forums. Please be sure to check it out.
Insect Hobbyists Mantid Forum - This forum has been around for years and is a good source of information. I have met a lot of new friends here, from all over the world. I use to go here often before mantidforum.com was made. Now I just check it every couple of weeks or so.
Petbugs Classifieds - USA Classifieds. If you're looking for a place to sell or buy different kinds of inverts, this is the place.
Terra Typica Mantid Database - Even I must bow down to this incredible mantid database. As of my writing this, there are 180 mantid species WITH pictures! Click the link, then click "Browse the base", and then click "Show matching organisms".