Keyboards
 

As most have said keyboards can last a very long time. There is no limit to whats out there either. Blue tooth and what such. There are truley ergonomic keyboards designed and shaped for the human bady. They tend to run in the hundreds of dollars. What I failed to see is if the work space is ergonomic. Usually most people can tolerate a poor keyboard in a good work space. But if you suffer from carpal tunnel a truley ergonomic keyboard is worth its wait in gold.