RC tanks can be found at a number of online stores. HobbyTron has competitive pricing for small scale models. Horizon Hobby, Amazon and eBay often have these vehicles in stock as well.
Many hobby stores sell RC car accessories. I am not sure what else stores because I am not familiar with RC Cars or RC car accessories. You could check it out for yourself and see what you come up with.
The age range for rc tanks are according to which rc tank you would like to buy. Most of the rc tanks that I have seen are for children six years old and older.
Some rc tanks are able to shoot airsoft pellets or specific projectiles for the tank. Here is an example of a type of projectile for the rc tank: http://www.modelzone.co.uk/radio-control-rc/tanks/16th-tank-ammo.html
A number of US based online stores sell remote control aircraft. Two such examples are Horizon Hobby (http://www.horizonhobby.com/RC/) and Hobby Lobby (http://www.hobby-lobby.com)
There are no specific stores that sell RC helicopters in Seattle. There is a store located 13.5 miles away in a town called Woodinville. The store is called RC hobbies and has a wide variety of RC helicopters and parts available for purchase. Customers have rated the store as being excellent for customer service and selection. Visiting stores like Toys R Us can be a great resource for cheaper more child friendly models of RC helicopters.
There is different places to get your rc battery packs. Amazon says they have it I beileve. I would also check craigslist if I were you, it would be really cheap there.
There are a lot of online stores that sell RC motocycles. Ebay and Amazon could probably get you a RC Motorcycle at a discount price. Otherwise there are sites such as www.2wheelhobbies.com and www.rchobbyexplosion.com that you can find new models.
Online you can pick one up for an affordable price on amazon.com or try your local RC Willy or Pier One Import stores.
you can find spare parts for micro rc boats in varoius stores i would check a hobby store as they might sell rc boats or check an online store as they should have just about anything
Online stores such as E-bay and Craigslist sell R/C Helicopters and if you have nearby Hobby stores, they may have pre-made R/C helicopters in stock.
There are many different RC Helicopter models that can be purchased. Many different stores sell these helicopters. Toys R Us is one example of a store that sells them.
RC tanks can be purchased at most local hobby shops and also are available online. Try websites like Hobbytron, airsoftrc, rcfever, nitrorcx, and dhgate.