This is no doubt the most realistic Poké Ball replica I've ever seen. Most of the Poké Ball replicas that I've seen have had a cartoonish look to them. This one shows us what it would look like if it actually existed in real life. It was created by Jasper Hams of MasenkoProps and it even comes with a cool display case that features the logo of Silph Co., which is one of the technology giants of the Pokémon world.
If you want one, you can order it at Jasper's Etsy store for $133.55. They are made to order, so you might have to wait awhile to get it. If you're a hardcore Pokemon fan, though, it looks like it'd be worth it.