A good place to source seeds is in your community. This is because people in your area know best what grows there. Ask friends and neighbors if they have seeds they can share with you. Also ask them to recommend you varieties to try and local garden centers, seed libraries or seed swaps where you can find them.
Seed swaps are events where people who have saved seeds from their gardens or who have excess purchased seed can trade seeds with each other. Knowledge, ideas and practices from different gardeners and their cultures are passed along too.