As of today, fewer than 1,000 Automatic Dependent Surveillance-Broadcast (ADS-B) Out rebate reservations remain available from the FAA. Because aircraft owners are reserving rebates at an average rate of 60 to 100 per day, the available rebates could be exhausted in two weeks—or sooner. Any aircraft owner who wants to claim a rebate and has not yet done so should make a reservation now.
Source: aopaADS-B rebates nearly gone