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I buy wall warts at the local thrift store for $1 or less. I do not trust the regulation. They are often over voltage or maybe the voltage depends on the load.
I build little PCBs with a regulator, the required 2 caps and a power indicator LED on the regulated side. The PCB has a 2x3 male header that plugs into the power strip of a solderless BB. The wall wart connects to screw terminals. I etch several of the little regulator PCBs at a time and populate them using a regulator with the voltage and current I need for each project.
The current version is for TO-92 package regulators which limits it to 300mA. I like it so well that I plan to make similar ones for larger regulators.
Power your device that requires 4.5VDC and up to 700mA. You can customize your power with the correct Adaptaplug™ (sold separately). Good as a backup or replacement power source for your device, a noise filter is included to reduce noise from the adapter. UL listed and ENERGY STAR® compliant.
* Delivers 4.5VDC and up to 700mAh to your device
* Just select the appropriate tip for your device (sold separately)
* Replaces catalog #2731765