Many dealers online sell cheap cars. The best thing to do is to look for dealers in the area you live and find them online and see if they sell online.
The sale of guns online is regulated by the Federal Government. Therefore in order to sell guns online, a person must contact a dealer with a Federal Firearms license in order to sell them. Guns America and Gun Broker are 2 places where one may sell guns online.
www.gunsinternational.com
First they go to a manufacturer's warehouse. From there they are sent to distributors who then sell them to dealers, who, in turn, sell them to customers. Government orders of guns may be shipped directly to army arsenals bypassing distribution channels.
The internet. There are many online Airsoft stores that sell Tokyo Marui guns.
Dicks sells air guns and rifles differently in each state. As an example they will not sell any air guns / rifles or bow & arrows in California. In other states they may sell a full line of BB guns.
There are three types of auto dealers. Wholesale dealers sell to wholesalers and auto dealers rather than to the general public. Retail auto dealers are allowed to sell to auto dealers like Wholesale dealers, but they can also sell to the public. Finally, Auto brokers are allowed to sell autos on behalf of a customer (consignment).
There are a wide variety of dealers, from national chains to whole in the wall stores that look like they sell stolen merchandise. The better business bureau can steer you right at http://www.bbb.org/central-california/accredited-business-directory/audio-visual-equipment-dealers
California has several hundred dealers which sell used Ford pickups. Cars.com and www.yellowpages.com will both help you find a dealer in you area.
You can sell 4 in a 12 month period without a dealers license. Sell that 5th vehicle and you need a dealers license.
There are a few stores that sell car batteries online for a person to buy for their car. The best places to check are auto parts dealers such as Autozone and Napa auto parts.
If you sell even 1 car for a profit you need a dealers license. If you are selling them at a loss then you need no license but what would be the point of that.