Where to buy insects? (Website)

There are lots of providers online, depending on what you want. This mainly applies to cockroaches and spiders (not insects, I know). Really, you can get a lot of stuff from a biological catalog, my dad was a teacher and use to let me order bug catching equipment from it. You can get stuff like butterflies, mantids, beetles, etc. If you want more exotic stuff you're going to have to look online. There's a dude on tumblr, Bogleech, who's a pretty big expert on stuff like this and he's pretty friendly, you could ask him. He's currently keeping leeches but has hissing cockroaches as well. He knows where to get stuff.