Live rat traps, need help!!?

I am so pissed off about this rat that was supposed to be a pet, and now its loose, and it thinks its wild. i really need a way to catch it, but humanely cause i dont want to find a dead rat anywhere and i really hat how he thinks he owns the place. no where in town has big enough traps, so i need a website, preferably not above $30, and it should have PayPal, the cage would probably say squirrels too. i hate that little pest, please help!