Fridge magnets
Realty, HVAC, plumbing, cleaning, and takeout numbers that stay on the door.

Business-card fridge magnets, trade-show handouts, and referral codes that live in the kitchen instead of the recycling bin.
Realty, HVAC, plumbing, cleaning, and takeout numbers that stay on the door.
Hand them out. They go home. They stick to a fridge or a file cabinet.
Print a code or a 'refer a neighbor' offer. The magnet keeps working after the event.