Frugal Living Dilemma #1: Liquid Soap Dispensers

Okay, here's the first dilemma in my new series (info about the series is here).

Liquid soap dispensers frustrate me to no end.  The tube that pulls the soap out to the pump is never as long as the bottle is tall!  I think the manufacturer's do this so you can't use all the soap you buy and have to buy again sooner!  Do you have a trick for getting all the soap out and using it?

I've thought of saving bottles and then combining them, but I almost always have a different scent, and I think mixing all those random scents wouldn't make a too-pleasing smelling soap.  What to do???