I believe you are taking about the typewriter? if you those are the latter models as Smith and Corona where separate companies until they merged. to buy one, or you me worth, difficult to say without the model kind and serial #. this site, http://site.xavier.edu/POLT/TYPEWRITERS/index.html, is a great resource to help you. has great pics too.
The best site to purchase Smith Corona typewriter ribbon (considering price and reliability) is via Ebay. The typewriter ribbon can also be bought on TigerDirect.
None of the 03A3's are antigues
One can purchase a Smith Corona ribbon on websites like Smith Corona Type Writer, Amazon, Office Depot, Typer Writers Supply, Smith Corona or BB Crafts.
My Smith Corona typewriter is worth about 2,500 its antique
"I would first try Amazon and Ebay to see if you could find a Smith Corona in your price range. Other places to try are Staples, Office Max and other office supply stores."
How do you change the typewriter ribbon of a Smith Corona 1940?
There are many websites where one can purchase a Smith Corona website online. They include smith-corona.buycheaper.com and the Typewriter Supply website. One can also bid for a Smith Corona typewrite on Ebay.
where can i find a manual for a smith corona deville 450 typewriter
depending on condition a Smith Corona 1903-A3 should bring from $700 to $850
There are a number of online retailers that sell Smith Corona typewriter ribbons such as amazon. Amazon has a large selection of Smith Corona typewriter ribbons and also offers free shipping on orders that are $25 or greater.
The headquarters of Smith Corona is located in Syracuse. It was started by John Smith who continues to own it. They produce Thermal Labels, but use to make scientific calculators for the public.
Smith Corona no longer produces typewriters. They have not produced typewriters for over ten years. Unfortunately, the likelihood of there still being a Smith Corona typewriter that has never been used before is very slim. There is nowhere that one can purchase a brand new Smith Corona Electric Typewriter as museums don't sell their items.