Yes Amazon.com does sell popcorn machines. You can find popcorn popper machines here http://www.amazon.com/Gold-Medal-Funpop-Popcorn-Machine/dp/B001NFKQ3W
There are various sites available that sell commercial popcorn popper machines. For all your popcorn popping needs visit www.popcornsupply.com or you can try this site for a guide to buying popcorn popping machines www.concessionstands.com.
Popcorn machines do not have built in butter makers. Butter must be melted on the stove and added to the popcorn machines bin. The best butter to use is a dairy product that can be purchased at any grocery.
Gold Medal machines provides popcorn machines, and can be purchased for a reasonable amount of money. The machines can be found at http://www.gmpopcorn.com/.
There are several websites that sell popcorn machines. A few that I found are www.popcornplaza.com/ , www.thepopcornmachine.com, or www.vendingmachinesworldwide.com
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The best popcorn machines are from reputable brands such as Gold Medal, Paragon, or Maxi-matic. A popcorn machine should be purchased in new condition in order to ensure functional parts.
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One can find more information about popcorn machines online at various websites. One can find more information about popcorn machines on websites such as KeepItPoppin and Concession Obsession.
There are many different types of popcorn machines. Some are for home use, and some are for commercial use. Commercially, there are the "old fashioned" cart popcorn machines, there is also a similar-type of machine that sits on a counter top that is often seen in a cinema. In the home kitchen, there are small appliances such as air poppers and oil poppers; and there are also modern built-ins that are used in a home theater setting.
Popcorn popper machines can be purchased or ordered from a variety of places, especially over the internet! You can purchase this from Walmart.com, Target.com, hsn.com, or Amazon.com!
Simple machines were used quite frequently in ancient history. Simple machines were used as building blocks for the machines that are used today.