I was surprised not to see a thread about FlyCafe, so I'm starting one because their cultures produce loads of flies, (they sell melanogaster and hydei) can last for months, and it's about 5 bucks for a 32-ounce deli cup full with the ventilated lid, which can be used for other things once the culture finally stops producing flies. They also sell the same 32-ounce deli cups with ventilated lids empty for cheap - like 6 bucks for 10 of them. I've ordered from them twice, and I'm about to order more stuff from them this week.