1960s Smith-Corona Coronet Electric 12
Up for sale is a beautiful Smith-Corona Coronet Electric 12 electric typewriter. This typewriter is an extremely reliable portable electric typewriter, and would be perfect for heavy typing. This typewriter has a nice balance between keeping a lot of the feel of using a manual typewriter, while having the benefits of being an electric machine. The carriage return and backspace, for example, are still independent of the electric motor, however the keys are similar to a mechanical computer keyboard, and require very little force. The 12 inch carriage comes in handy with larger pieces of paper, or writing landscape on a regular piece of printer paper. However, because this typewriter is quite large (and also fairly early on in the world of electrics) it is quite a heavy portable typewriter.
Universal ribbons which are sold on this site fit this typewriter perfectly, and the owner's manual for this typewriter can be found here: https://site.xavier.edu/polt/typewriters/SCMCoronet.pdf
If you're in the market for a reliable electric workhorse, then this is an excellent option.