As someone who got a "cheap" horse and is now paying to board a totally worthless permanently lame pasture ornament....I would wait and find a "better one". The purchase price is the least expensive part of getting a horse. Costs the same to keep a good horse and a bad horse, or a lame horse vs a sound horse. Pay a little more now to have a usable horse later. Or pay less now and in a few years you might end up with having to decide what to do with your indefinitely lame horse.