Beware of "renting" anything. While it might seem all you can afford to do, you will be paying way more in the long run. That's how poor people stay poor - they pay lots more for things than rich people do.
Chromebooks leased via the $28/month plan are available to businesses needing 10 or more units. Educational customers will pay $20/month per unit for 10 or more units. It should be noted that these subscription fees cover more than the amortized cost of the hardware plus interest. Think of this as an option for outsourcing many of the I.T. support functions required to manage traditional PC's. You can learn more here: Chromebook