To rent buses?
ICE should open covert offices with some made-up organization name to “help immigrants become legal residents”.
They come in the front door and are ushered into a back office for consultations, then arrested by ICE and taken out the back gagged and handcuffed to bus seats. Then they can be returned to their home countries where they are “legal” residents.
Then there is my other favorite sneaky LEO tactic of sending letters to criminals telling them they have won something and arresting them when they show up to collect their prize. That might work for visa overstays and previously released illegals who failed to show up for deportation hearings but the people at their last known address claim they don’t know the person in question.