this is a pretty us-centric list. I hope to get more resources for people outside of the US.
Mulberry Farms - I use this for most of my bugs. I have no complaints. c: Wide variety of feeders.
Linda’s Gone Buggie - this is a MUCH smaller company, so mistakes with orders are somewhat common (like maybe 5% of the orders I’ve gotten have had some problem like feeders I’ve ordered not being included), but problems are quickly and generously corrected. Very good prices and a wide variety of feeders.
Dubi Deli - focuses on dubia roaches. Good prices, but feeders often arrive very thin and dehydrated. Ships out extremely fast though! If you need bugs in a hurry, try this place.
WestCoastRoaches - When I need to buy more roaches, this is where I go. Good prices and weekly deals. Also ships out VERY fast.
Lady Silkworm - Focuses on silkworms! As a rule, silks are very sensitive to fungal and bacterial infections. These are probably the hardiest silks I’ve seen.
Kimbrell’s Coldblood - Another dubia-centric place, but also sells discoid. I’ve never bought from this place.
Rhactastic Rhacs - Yet ANOTHER dubia-centric seller! Best prices I’ve seen on breeding packages of dubia. I’ve never bought from them.
Florida Silkworms - Silkworms only and only in LARGE amounts (500 or more). Also dubia. Never bought from them.
Great Lakes Hornworm - Hornworm centric, but also sells super, meal, and crickets. Never bought from them.
Rainbow Mealworms - Despite the name, they sell a wide variety of feeders. I’ve never heard a complaint about them, although I’ve never personally bought from them.
Phoenix Worms - sells phoenix worms (aka reptiworms/calciworms). My reptiles aren’t a fan of these critters, so I’ve never bought from here.
Reptiworms - See above. I HAVE bought from here, though. Prices are lower than Phoenix Worms.
Timberline Live Food - most of the stuff you see in pet stores is produced by Timberline. I’ve never bought direct from the company.
Roach Crossing - TONS of different species of roaches here, including some very unusual ones. You want pet roaches? Check this place out. Also clean-up crews for bioactive set-ups. Never bought from them, but probably will some day.
Fluker’s Cricket Farm - Notable because they sell hissing cockroaches. Also carries the most common feeders: crickets, mealworms, etc. Never ordered, but haven’t heard any complaints either.
The Live Food Warehouse - Looks like they have a pretty wide variety. Offers springtails for those who want to set up a bioactive substrate.
Silkworm Store - Pretty wide variety here too! Plus silkworms!
Rick’s Livefood - Sells a pretty wide variety, including stuff for bioactive set-ups.
RECORP INC. - Nice wide variety of feeders!
The Worm Lady - Mostly worm-centric. Also sells rodents, both f/t and live.
Super Cricket - Warning for VERY obnoxious graphics and flashing.
Live Foods Unlimited - looks like it has a nice selection of supplies, but a pretty limited amount of feeders. Sells crickets, giant mealworms, and wood cockroaches. (Queensland)
Sunstate Crickets - Crickets, mealworms, wood roaches (aka lobster roaches), and SNAILS. Very important for BTS owners. c: (Queensland)
Martyn’s Mealworms - Live and dried mealworms. Also snails! (Victoria)
The Reptile Doctor Shop - Silkworms. Also sells supplements and books, including the highly recommended Complete Chondro. (Victoria)
The ARCade - I find their website kinda hard to navigate. That’s their main site, but their store is here. They sell a pretty wide variety, including crickets, blowflies+houseflies, calci gents and regular gents (housefly maggot), mealworms, and cockroaches.
Insect Direct - Just live crickets.
Animal Supplies - Wider variety here, including locusts.