I baked my own. I used the complete feed I use (Full of oilseeds, protein meals, oils etc. - No grain, and only a small amount of molasses). I added oil, Chia seed soaked to make a gummy mess to bind it, some apple cider vinegar, salt, honey, and some soaked hay cubes that I also feed.
I mixed it all together, pressed it into a tray, baked it, then cut it into squares. It was kind of mushy, but held together, and they LOVED it, plus it was giving them a bit of nutrition on the days they weren't getting fed.