In pay envelopes

How it works: Coupons are distributed to workers with their paychecks. If payroll is direct deposit, the coupons are delivered by hand.

Cost: About $15,000 for 100,000 coupons, depending on the number of Zip codes marketers want to reach.

In elevators

How it works: Ads are broadcast on video monitors in office-building elevators.

Cost: $77,000 a week to reach two million office workers a day.