You can use Raffle River to do this.
However, depending on the state you live in, it may not be legal for your Non Profit to sell Raffle Tickets online.
Here is a list of the Raffle laws by state:
Resources By State For Selling Raffle Tickets
Originally Posted: https://www.quora.com/Is-there-an-online-platform-that-allows-a-nonprofit-501c3-to-sell-raffle-tickets
Originally Posted On: 2015-03-23