I have helped get a few horses out of the kill pen cycle. But it was more about saving those particular horses. They went to non riding homes. You have to be an experienced horse person to pick the diamond in the rough at kill pens. Another horse was there because it was " not fast enough for Polo". That was not the background the pen provided, and you rarely will get the real story from the pen… If the horse is a thoroughbred, standardbred or racing quarter horse you can get some of the background from the tattoo. Standardbreds actually make terrific trail horses. They are not common where I live on the West Coast. They tend to have calm personalities. But again, to make a purchase at a pen, you need someone with a good eye and feel for horses to help, unless you feel confident with that. I do hear about how the horse market is so high now. But is it really? If you start to look about in the not so obvious places, you may be surprised at what you can find. There are often a huge amount of teen 4h, equestrian horses going to local auctions in the summer when kids go off the college. There also are a huge amount of camp horses that get dumped every year. Camp horses usually make great husband horses. Also trail string operations dump their horses that are getting a bit too sore to do all day rides, but might be perfect for a husband horse, easy trail rides. Reach out to facebook pages for 4h, high school equestrian teams, state high school equestrian teams. girl scout horse camps, and google large scale horse vacation operations to ask if they have any horses coming up for sale. Google camp horse sales. Craigs list is another option. While performance horses are still retaining value, there will be an increase of average unwanted horses being “rehomed” due to the cost of hay as well. Camps will cut down their herd, trail operations will. Also you find as college is starting a horse that was needing to be sold, the price will drop as the kid has to leave for college and the parents don’t want to support a horse and college. Also let your farrier and vet know what you are looking for. Lots of ways to network for a horse that will be fairly priced. If you are offering a life time home, where the horse can live even after its not ridable, that is a huge bargaining chip for a caring horse owner that wants to find a soft landing for their horse.