Barb;
I can think of several sources for you. Whole wheat can be obtained through bird feeder suppliers, graineries and bird racing suppliers. Now that is going to be wheat straight from the field. A cleaner source would be organic grocery stores and a third would be your major grocery stores sells different forms of wheat, ie like wheat germ and organic wheat flour.
I personally use malted flour. The beer making supplies carry it. Although malt is usually barley, they may also have wheat. Malt occurs when the seed temperature is raised to 165 degrees for 45 miniutes converting all the starch to sugar. Malt comes in many different flavors designated light, medium and heavy. Then you can also look at the seed name for the variety of malt.
I like to keep light malt on hand, usually sold in 3 lb bags for around $10. It is extremely fine powder and becomes sticky when exposed to humidity. I measure it off in cup quantities into sandwhich bags and use it in fruit wine when I want to either give the yeast something to ferment against, like carrot wine, or when I need something to help balance out an existing wine, like banana. Malted barley wine is also very good by itself.
Tom