You will find it much easier to buy a snakeboard / streetboard online. Just do a Google search for "Buy A Snakeboard" and you should be able to find several websites!
Note: Be careful, there are many websites selling 'Ripstiks' / 'Casterboards' and advertising them as 'Snakeboards' ... They are completely different & are basically a ripoff of the snakeboard.
A snakeboard / streetboard is made up of two pivoting footplates, joined by a centre crossbar. The oldschool boards are made of plastic, and have a narrow bar. The modern boards are wide and made of plywood, they look like small snowboards / big skateboards.
Hope this helps!