Instead of paying for checked luggage at the airport, express mail it to the hotel for 1/3 the price.
Instead of owning a vehicle take public transit for your daily commute and use Zipcar for longer trips. It will save you thousands every year. Best of all, you never have to worry about theft, vandalism, repairs, hitting a pole, or having your shit break down.
Used rechargeables instead of disposable batteries. Get two sets for every remote and swap them out every other month. That way you never have to worry about running out.
Save money on trash collection by setting up a backyard compost. If you don't want to turn it get a rotating model.
Did the lithium battery in your Bluetooth speaker shit the bed? Go to ifixit.com they will give you the tools, schematics, and replacement battery for less than 1/3 the price of a new device.
Commute by bike? Instead of paying for repairs see if your city has a bike kitchen. They charge a $10 drop in fee and sell replacement parts at cost. For most repairs you can be in and out within a few hours. The only catch is that you have to assist the mechanics.