Those crafty Japanese toy inventors are at it again:
I definitely would try and build my own before I’d drop $361 USD (28,350 YEN) on this! Besides the few custom parts, it looks like you could get most of the kit from Home Depot.
Too bad there’s not a youtube video of this in action. There are a lot of vids of people shooting bottles into the air using bicycle pump rigged launch pads though so I assume this would be similar.
Hat tip: Raeshawn