The grain elavators where they buy the harvested grain generally sell the seed also.
The seed comes in 30lb to 50lb bags and is sold by weight or seed count. It also comes in larger bulk containers.
If you only want a hand full of seeds you might stop in and explain and they may sell you some out of a torn and spilled bag of seed.

How much do you want to grow? How much space do you have?

Hi Tim_the_gardner,

Welcome to The Seed Exchange.

The link below is to site that sells seed for several grains for human consumption.

Then you might try posting to The Texas Forum for finding out proper planting times. You might want to add more of a location to the garden zone box so it reflects (zone) 8 Dallas TX See I'm zone 5/6 S INDIANA

Since there is no forum that actually covers growing grains, I'd suggest you also stop by The Vegetable Forum

Good luck and have fun!

Sue...aka chemocurl

Here is a link that might be useful: Howe Seeds