There are many different sites that sell rc plane engines. Some include: http://www.hobbypartz.com and http://www.towerhobbies.com/. There are others if you look around.
Both RC plane are awsome because they are both planes.
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You can find RC plane kits at hobby shops, online retail stores like Amazon or eBay, or specialized websites that sell radio-controlled aircraft products. Some popular brands that offer RC plane kits include Tower Hobbies, HobbyKing, and Horizon Hobby.
RC cars sell for about between $119 and $200 each. Mini RC cars can be bought online for much cheaper. The cost of mini RC cars are about $15-$30 each.
The cost of an RC Plane depends entirely on quality of it, the cheapest ones are often found in the $100-$200 range, with sales putting them as low as $50-80 from time to time.
Stores and companies that deal directly with the hobby of electric planes could help you find an electric rc plane. Also, if you look on Ebay, Amazon, or Craigs List you might be able to find someone who would like to sell one to you.
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The number of pieces for an RC Plane Engine vary on the model of the plane. Here's a link that you may find helpful: http://www.rcairplaneswarehouse.com/
You can purchase an electric RC plane online from retailers such as Amazon. Once on the page, type "Electric RC plane" into the search field at the top of the page and press enter to bring up the planes.
The Dusty Crophopper RC Plane can be brought from websites that sells RC planes. Looking for hobby shops that sells remote controlled planes more than likely will have the model you are looking for or can help point you into the right direction to find one.