Where can I buy model cars online?
One of the favorite places to buy is Hobby Link Japan, available at www.hlj.com. They have a superb live database site which has pictures and a clear and concise ‘in stock’ display. The kits are incredibly cheap, but once postage is added you will pay close to local prices! You will get a good selection and it is a fantastic place for accessories. Worldwide postage is slow, and it often takes a week just for the parts to leave Japan, so think ahead when ordering! I usually receive items within a 5 weeks, 6 if you go for the cheaper surface mail option.
A new and up coming company is Media Mix Hobby, who have a fantastic Race Car accessory list and carry many items in stock. Postage is as fast as they get and once again you can view a live database. Available at http://asiapac.worldpay.com/cnb/shop/mediamixhobby tell Wong that you are from Automotive Forums and he will treat you extra nice!!!
Local to the United Kingdom is Grand Prix models, available at www.grandprixmodels.com. It also has a live database but without the pictures. Very fast postage service if the items are in stock, but order out of stock items at your risk!
Another site is
www.1999.co.jp. They tend to be slightly cheaper than HLJ and their site has more info on kits, including scans of the instuction sheets and pictures of the box contents.
Others include:
www.modelcarkits.com
www.towerhobbies.com
www.ehobbies.com
www.replicarz.com
www.legendshobbies.com
And, of course, the infamous
Ebay! Look in the
Toys & Hobbies > Hobbies & Crafts > Models > Automotive category, but don't forget to search all of Ebay for items that may be mis-filed.
Also:
Originally posted by erix7
Japanese shop Rainbow 10
http://www.rainbowten.co.jp/english/index.html
because they usually have the latest kits first 
and Australian shop Hobby HQ
http://www.hobbyhq.com.au/
because they have low prices (and shipping is cheap too) and often can get you kits that are long OOP.
Huge list of Model-Related sites:
http://www.rocketfin.com/mcc/partslinks.html
