What is Barley straw?

Ask around. You may find some producers or farmers that have been harvesting barley that may have some for sale for you, or who may know a neighbour, friend or relative (and which may know people as well, and so on and so forth) who may be able to sell some to you. You can also find advertisements in local town/county classifieds, local or regional ag newspapers (like the Western Producer for most folks in Western Canada), online classifieds like Craigslist, Kijiji or even eBay, or even some farming websites will have classifieds for you to browse through.

North Dakota, Idaho, Washington and Montana are the top four barley-growing states of the US. Alberta and Saskatchewan (of Canada) are the major barley-producing provinces. You are very likely to run into some farmers that may be willing to sell you some barley straw if you look into these states and provinces.