Hello Mao! Nice to meet up with you again.
Here's what I found for you:
WHERE TO BUY:
Hirobo "Almost-ready-to-fly and precision kits available" kit:
Another large scale model:
Century Helicopter Products
Rotary Flight AG (Switzerland):
RC helicopter parts:
Go to their "Airplane" page:
Type "helicopter" into the search box at top right.
Here's one kit, the Heli-Max MX400 EP:
Midland Helicopters Ltd. (UK):
Explore the site from the "Navigator" page:
Be sure to scroll the whole way down this long page to find such
categories as "Gas Turbine" and "Helicopter Kits."
Vario Helicopters (Australia):
Xtreme RC Products:
"International List of Scale Model Related Web Sites - Helicopter":
If you're interested in canopies, check out Arizona Heli:
Also check out DMOZ's directory on scale model RC helicopters:
Of course, you can extrapolate some idea of costs by reviewing
merchandise at the sites I listed for you, above. Here's some
additional resources that can help you estimate just how pricey your
new hobby may be.
DMOZ's "Radio Controlled Helicopters Frequently Asked Questions"
The link "How much did it cost?":
provides a very good, generalized, breakdown of costs.
"Big Jim's Radio Controlled Aircraft Page":
"The average model helicopter costs more than a typical model airplane
with an inexpensive heli, engine, and radio combo costing upwards of
$600. Helicopters are usually made of plastic, metal, or composite
materials and are more or less "assembled" as opposed to a model
airplane in which there is much cutting, shaping, sanding, and gluing.
A helicopter kit can be assembled in just a few days where as many
model airplane kits may take months to build."
I'm afraid I ran into difficulty trying to find information on
maintenance and operational costs. I have listed some excellent forums
for you, below, where you can search for information on those costs.
My recommendation is that, once you've narrowed down your choices of
models you'd like to buy, post some questions at those forums
requesting feedback from fellow RC helicopter enthusiasts who own that
same model. Not only can they give you an idea of how much you should
budget for operational maintenance for specific models, they can tell
you if they've had any problems with that model, period.
DIY Network has a plethora of links for RC helicopter enthusiasts:
Scroll down to:
Special Resources for Radio Control Hobbies, episode 404
Academy of Model Aeronautics (AMA)
International Radio Control Helicopter Association (IRCHA)
Model Rectifier Corporation (MRC)
North Bergen, NJ
RELATED PROJECTS [these are all hyperlinked]:
Introduction to the RC Helicopter
RC HobbyVisions: Boats, Tanks, Helicopters, Toys and Robots
Electric RC Helicopters: Computer-Simulated Training
Electric RC Helicopters: Piccolo 'Fun' Assembly
Electric RC Helicopters: Introduction
RC Helicopters: Crashproof Training
RC Helicopters: Flying Lesson
RC Helicopters: What Makes Them Work
Las Vegas Hobby Show: Planes, Helicopters and Radio Tech
ALSO IN THIS EPISODE:
Radio-Control Helicopters: Introduction
Radio-Control Helicopters: Aerobatic and 3D Stunt Flying
Radio-Control Helicopters: Scale Models
Radio-Control Helicopters: A 'Green Giant' Whirlybird"
HeliGuy: Guides and Forums:
Remote Control Helicopters FAQ - Newbie Questions:
RunRyder - Scale Model RC Helicopters:
Besides the discussion boards, you'll see links for purchasing Starwood
products at the top of the page.
RC Helicopter Fever Forum:
(Scroll about halfway down the page.)
At this page:
Select "helicopters" from the drop-down menu at left to retrieve articles
and reviews about RC helicopters.
RC Universe's Helicopter Forum:
Scroll halfway down to see the discussion forum.
One discussion of possible interest: "Turbine VS Gasoline VS Nitro-methane
model scale helicopters
model scale helicopter + remote control
model scale helicopter + remote control +average cost
RC helicopters AND average cost Or budget
realistic RC helicopters AND average cost Or budget
realistic RC helicopters AND electric OR gas OR turbine
model scale helicopters
large model scale RC helicopters +kits
large model scale RC helicopters
model scale RC helicopters +FAQ +beginners
model scale RC helicopters +kits
model scale RC helicopters AND operational costs
model scale RC helicopters AND maintenance costs
I hope my research is of help to you. If you have any trouble navigating any
of the above links, please post a "Request For Clarification," and I
will assist you.
This seems like a great hobby -- have fun!
Google Answers Researcher