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.
Check your local yellow pages for any hobby shops that migh carry rc battery packs. Little shops like that will be the cheapest, and will also be able to help you with your other problems.
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.
Rc battery volts start a 8.4 and end at 20.6 volts, yes it is a pretty high voltage but it will make your rc car go a whole lot faster so if I was you I would buy it from hobby partz
Yes, you will require a r c battery charger for all remote control toys. R C battery chargers can be purchased in most large department stores or electronics stores. They can charge your toy up to 100 times.
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.
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.
You can find rc battery chargers at places that specialize in rc supplies or similar items. This includes places such as RC Planet, RC Mart, All Battery, and etc.
Model shops which stock rc cars also stock the batteries that they need. Some of the smaller, lighter cars do not require battery packs and run off AA batteries which are easily available on the high street.
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.
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.