It's hard to find small private barns, but they are the best when you can find a good one. Besides tack shops as katec1991 stated, you can also check an Agway or some other horse supply provider. They are a good one to ask because they will be delivering grain/shavings to a wide client base. A tack shop may not be aware of some of the smaller farms around, but everyone needs grain/shavings or both so it's a good place to do some research. Just be careful with private barns. They don't always have someone on the premises to bring horses in/out in storms ect. The only positive of a large barn is that someone, usually a barn manager, should always be around in case anything were to ever happen. If they aren't around there is a good chance another boarder is. Private barns usually require a horse owner that will be at the barn on a regular basis.