several of 3 sizes of cage traps works well for me
body grips have limited use unless submerged for beaver or attic squirrels
subscribe to Wildlife Control Magazine and have Robb Russell at
http://www.wildlifepro.com build you a website and hang on to your bootstraps
Robb uses ALL the hit words so your website gets the exposure when people google something like "bat removal in (your town)" or "nuisance animals".
As for prices, have your friends call the competition and ask them what the charge is to "remove a squirrel I see going in and out of a hole in the end gable."
They should be able to give a ball park estimate since you've given them all that info, as opposed to "a noise in the attic".
Hope this helps a bit