When my mom had an exterminator come and exterminate the roaches in her home it cost her $300.00 for the first visit for them to set traps, spray and put bait out.
They then came back to her house every 3 months for the first year for another $75.00 each visit to continue to treat the home.
So all in all she paid $525.00 for the total price of getting the cockroaches to go away and keep them from coming back.
That's not too bad of a price because roaches are nasty and it's worth anything to me to get rid of them.