Roach motels!! emergency housing for the little b&^%$#$@.
Set out roach motels, and also roach-bait. Under the sinks, in dark corners, around where you see them. Change and renew as needed.
Clean like a maniac - no food residue around.
Cardboard - what they said.
If you are sharing a common wall - apartment - townhouse - your neighbors will also have to get on the bandwagon.
good luck!
ta,
mew