I just did a search in the other forums, and the Producer's Pride sweet feed that they were recommending from Tractor Supply, looks like it is no longer carried. Both of the Producer's Pride feed I saw on the site was pellets!
When clicking on the link for it, it now goes to:
"Oops! Something happened with your request!
We were unable to process your request. Please try again. If the problem persists, please contact customer support."
I did a search on the Tractor Supply website, and this looks like what you would want to get for a sweet feed. Not sure how much more it was than P.P.:http://www.tractorsupply.com/en/store/purinareg%3B-omolene-100reg%3B-active-pleasure-horse-feed-50-lb
•Provides 100% of the required vitamins and minerals
•Nutrient and calorie dense blend of natural whole grains for lower feeding rates and less risk of digestive upset
•Whole grains are a natural source of antioxidants, phytonutrients and fiber
•Contains a unique blend of molasses and soy oil for a higher fat, low sugar molasses that horses love to eat
•Contains balanced nutrition and added vegetable oils for a shinier, healthier hair coat, skin and hooves
•Hay Or Pasture - designed to be fed with hay and/or pasture
•Animal Type - Horse
•Life Stage - Adults & Mature Adults
•Package Size - 50 lb.
•Type - Grain
•Brand - Purina®
That bolded item above would be the only thing listed above that would be of any concern.
If you can't find something similar, basically, from what I have read, sweet feed mix is basically CORN, OATS, BARLEY (COB) and molasses. Maybe you can find somewhere you can buy the grains/molasses seperately and make your own sweet feed!