We can do it too...They (the company offering the phones) pay a $50 bounty every time you sign someone up for an "obamaphone", I have some friends that make a living off of it.
You can also give them RX/Dental/Vision discount cards (some pay up to a dollar every time they use it). You can also give them coupons, free passes to waterparks (so long as you got them for free), and many other incentives.
The rules state that you may not pay for it, and it may not be something usually paid for but is provided at no cost as an incentive. Outside of that, there is quite some flexibility.
You can also give them RX/Dental/Vision discount cards (some pay up to a dollar every time they use it). You can also give them coupons, free passes to waterparks (so long as you got them for free), and many other incentives.
The rules state that you may not pay for it, and it may not be something usually paid for but is provided at no cost as an incentive. Outside of that, there is quite some flexibility.