Two months ago I picked up a used Sony a9 mirrorless camera body.  It is their top-of-the-line offering for shooting sports.  I used it exclusively to photograph the Amputee Soccer World Cup tournament.  It performed flawlessly and was a joy to use.  It is now for sale on Craig’s List because I prefer my Sony a7r3 model for all other types of photography and won’t be shooting sports again until the next World Cup in two years.  By then a new model will have emerged so it makes sense to sell this one now.