The Lavatube is a nice VV
mod for the price and perfectly good to start with. It's far better than any of the little E-cigs that look like cigarettes. You need to be aware of the 2.5 amp limit and don't expect to use a low resistance cartomizer at 4.5 or 5 volts. Use 3 ohm cartomizers and you'll be able to use the entire range of available voltages. I have one and I'm very satisfied with it. Don't expect it to do what it isn't designed to do and you'll probably like it too.
Sorry I can't help you with the price. In the U.S., you can find kits as low as $60USD, but I don't know what places ship to Malaysia or how much the shipping would cost if they did. The kit in your link converts to about $78USD, which is good considering the extras it comes with. The only other thing you might want to consider is if there is a warranty and how long the warranty is.