The Wave The Wave is a new invention - it's something like two pads, with one wheel each, linked by a pivot. Hard to picture? Check out the review for more! Not a snakeboard, and not a skateboard, ...
Why is there such a wide range in prices? Like any purchase you are considering, the old saying that you get what you pay for generally applies to Longboard skateboard purchases as well.
Remember that none of these are rules. You should go with what you want, and make sure you have fun. The longer you skateboard, you'll get more of an idea of what you want.