We needed some seed for a wedding last Saturday. I spent hours trying to find the seeds locally. Finally, I went to Ebay and using search term"wheat grass", there were many offerings. I bought 2 pounds for $10 delivery included. Then, it was on to experimenting. There is alot of good information on the internet about how to do this. The first one We made looked great. Unfortunately, when We started the batch for the wedding centerpieces (7 I think), this time the results were not as good as the first time. They were okay, but not as tall and thick as the experimental one was. Anyway, the bride loved them.
Since then, I ran across some information that they may be available at a health food store that sells bulk grain, rice etc. I think that there was even a youtube video about wheat grass.
Hope this helps.
It won't take long to get to be 3 inches. Maybe 4-5 days after germination
Before all this, I tried annual ryegrass. The wheat grass makes a much better showing.