Where should you buy a horse from?

That would depend on what you want the horse for. if you're looking for a 'pasture ornament' then please rescue a horse by adopting it, or buying and gentling an older mustang. If you want a competiotion horse then again look at rescues first then go online to horse sale sites. If those sites don't have anything call the local barns and ask if they have anything for sale. Don't forget newspapers/magazines, word of mouth and feed store ads.