Or, what if you found someone who wanted to to "board" their horse their. Your could try to find a friend or friend of a friend who was looking to get a horse, but doesn't have he space, or someone who would just rather house their horse else where. Then depending on that person specifically, you could organize a boarding arraignment, charge them, or if you don't care that I doubt it would be hard to find someone if you didn't charge them. Then you wouldn't be paying for the feed, you can feed them the same amount, and your horse could have a buddy.
If course, this may not always work perfectly. You'd have to find the right person with the right horse, but its something to keep an eye out for.
Thats how I got my horse. A friend of ours who we weren't super close to originally offered to give me riding lessons, and before I knew it she was helping me horse hunt. She had the same situation and needed a companion for her horse, and it worked out great! You could make a huge difference for someone who doesn't have space for a horse, or money for boarding. I don't think I would have been able to get a horse without her.