My first thought is to get yourself some food grade DE. Clean out your coop, nesting boxes, everything, then put down a thin layer of DE, fresh layer of litter and another thin layer of DE. You can kick the littler around a little to mix in the DE. The DE will penetrate the roaches shell on contact and dehydrate them. That spells DEAD. I don't dust my birds because they take dust baths in the litter with the DE and get it all over. Much safer than dusting them with a chemical, in my opinion. I also put DE on their feed once a week to kill internal parasites. I sprinkle it around the floorboards of the feed storage are of my coop to kill/discourage pests. So far the only pests I've had to deal with was wasps that stopped by last month to check out the coop. They didn't stay. I keep a sticky fly trap hanging high at the ceiling during the warm months. I've only had chickens for a year now, but I'm learning fast with the help of my peeps on BYC.
I bought 50# of food grade (must be food grade to use with animals) DE at a farm store in Topeka, Kansas for $30. Maybe used a 5th of it since Fall. I've given some away too.
Oh, and THANKS for the entertaining commentary on finding the roaches! Cracked me up!! I'm a girl but every time I hear someone say "I screamed like a girl" it just cracks me up. Guess it's because it's always guys saying it. You just have to able to laugh at yourself. It's so healthy!!