The Logitech K310 Washable Keyboard is retailing for S$59. It is a wired keyboard that is pretty reasonable priced.
Most of our keyboards are filthy and a study done in 2008 suggests that it had 150 times the recommended limit for bacteria (five times as filthy as a toilet seat). What lies beneath the keys on your keyboard? I say dirt, hairs, pet fur, food crumbs, dandruffs, etc.