Welcome to MBc, InfoCentral! The NE5 is now out of production (a very bad decision by Whizzer in my opinion), but you can still find them at some dealers and on eBay. If you buy a used one, you would be better off getting a 2005 through 2007 NE5. Some of these bikes will still need modification to stay trouble-free. It is important to make sure the engine is fitted with mushroom lifters to prevent some very costly repairs. Try to stay away from the 1999 through 2004 WC1 models unless you get one for a bargain basement price. I say this because you will need to spend over $400 for an upgrade kit for the engine to avoid having problems. However, I have heard through the grapevine that the upgrade kits are no longer being made, and the supply of these kits will ultimately dry up.
I don't mean to chase you away from a Whizzer, because they are great bikes. I really, really like my 2005 NE5. You just have to tweak them a bit, and then you'll have a nice reliable and fun ride.