Banggood! Oh man, I love that place!! It is funny you mention that bicycle kit, as just yesterday I watched the installation video of that. There's a lot of people riding those around my neighborhood. I looked it up, and here in Arizona you don't have to have a motorcycle drivers license to ride them, and they don't issue a title for them. But get this; you DO have to register them, and you DO have to buy vehicular liability insurance for them!! They will get in your wallet no matter what you do won't they??
I dabble in electronics projects, and that Banggood site has fantastic prices on various modules and electronic goodies. I bought a Bluetooth receiver from them for 5 bucks with free shipping, and later saw the exact same one in Walmart for 20$. So far I have been quite happy with everything I bought from them, and it's all free shipping. It takes about 3 weeks to receive things however. My "Wish List" with them is over 50 items!!!
Re-the pricing of things for modeling, it is the very same thing/problem for full size boating, Ultralight Aircraft, and of course, times 1000 for full size aircraft.
AV8TOR