Might I ask where you are shopping, Vinylhanger? I'm asking because a few years back, DH had to go on a GF diet. I had to search out things to make sure that he STAYED on that diet. I found that stores don't always put things where it makes the most sense? Well, at least not to me. Take Freddies, for example, they have a GF mix and product section (the Chebe stuff is amazing!) And then you'll find some in the dedicated Bob's Red Mill section and then still more in the regular baking section. Sigh. One has to walk most of the store to find all the options! At least, on my side of the river.
Whole Foods wasn't much better, as I recall, but they closed our WF some years back. New Seasons isn't one that I frequent, but you could try there.
All of the above should have websites that might save you some driving? You might check Bob's Red Mill to see if they have instructions to convert to Bread Machine use?