Leaky faucet = dollars going down the drain, 1 drip at a time. I never considered it to be worth bother with until I started reading about how much it adds up to.
The faucet in question is almost 4 years old, I presumed it was well out of warranty and tried to arrange a plumber to repair. My thinking was that I would waste tons of money buying the wrong seals (or buying a whole kit).
Luckily for me, I couldn't get a plumber to stop by. I decided to contact the manufacturer and found that they have a lifetime warranty! They shipped out a complete repair kit to me that day, no charge. I received it today and had it all swapped out (including scrubbing out buildup) in under 15 minutes!
...and I was ready to pay a plumber an hour of labor for that! I very nearly needed a facepunch! :-)