I fill a tub from Walmart (about 6" x 7" or so - the kind with the blue plastic top, comes in pairs) with:
bran
flaxseeds
sunflower seeds
oats/oatmeal
beet pulp
alfalfa pellets
The price per tub will be bid, and people can order as many tubs as they want, each customized if they so desire. All you need to do is add hot water!
Then you can tell your equines featsing on this treat that not only do they get a tummy full of mash, but that they helped a very deserving rescue. You pay shipping via UPS or USPS from 63104 zip code.