I use bar soap instead of liquid hand soap for the bathroom sink. It lasts 4 times as long!
And if you use an all natural bar soap, like with oatmeal, it doubles as a nice face cleanser too. No more buying a new liquid hand soap w/ pump every time you go to the grocery store!
And it doesn't contain Triclosan (like most liquid hand soaps do) which new studies suggest is no longer good for you.