I've been doing the Clark Howard thing and it really does make a difference. I have also bought refills for my disposibles on Ebay.
You can also buy a razor drier now but I dry and clean mine off with a regular bath towel. I can get mine to last a month or 2 like that, which is good enough for me. The theory behind it is that your beard isn't tough enough to dull a steel blade but the chemicals in your shaving cream and water wear it down and pit it, ruining it. If you clean and dry it you make it last much longer. Disposable razor manufacturers don't publicize this for obvious reasons but it works.
For folks who don't like to click on links:
Aug 31, 2007 -- Drying your razor blades extends shelf life
In February 2006, a gentleman called the show and spoke about using the same razor for a year. He revealed that blades don't degrade from shaving, but rather they corrode from the moisture that collects on them once you're done shaving.
He went on to explain his ritual of using a blow dryer to dry his razor after use. His call prompted others to speak up and share their tricks and tips for maximizing a razor's life.
Clark got inspired by the whole discussion (and the expense of shaving blades!) and decided to take a single 17-cent razor and make it last for one year.
He didn't dry his razor with a hair dryer, but instead took the lazy man's approach of just blotting it dry on a towel. It lasted for a whole year and he was very pleased to not have to throw money away on blades anymore.
Recently Clark got a letter from another man who heard the on-air talk about drying your razor and invented a device to do it easily. His invention -- the Razor Pro -- has been sold on QVC and through a drugstore chain.
The Razor Pro looks like a battery-operated pencil sharpener and dries your razor in two minutes. Clark's executive producer, Christa, thinks it can double really nicely as a fingernail polish dryer for girls.
Check it out if you're looking for a way to cut down on one of those smaller expenses that really adds up over time.