Wildflower Farm and Prairie Moon Nursery are common sources for seeds.
To buy sea oats, you can find them as potted plants or seeds at native plant nurseries. Be aware that "Sea Oats" often refers to two different species: ( Uniola paniculata ), which are vital for beach dunes, and Northern/Inland Sea Oats ( Chasmanthium latifolium ), which are popular for shade gardens. Where to Buy Sea Oats buy sea oats grass
McKay Nursery Company has larger #1 containers available for around $28.99. Wildflower Farm and Prairie Moon Nursery are common
You can purchase these plants from specialized nurseries. Buying from licensed nurseries is the only legal way to obtain them, as harvesting wild sea oats is illegal in states like Florida and Georgia. : which are vital for beach dunes