What I do is use a USB wall adapter and USB charging cables for each device. I have a PSP usb charging cable, which has both a mini-USB and a AC plug, to charge my reader. I know USB charging cables for Palm devices are easy to find for fairly cheap. If your cell phone charges from mini-USB you may be able to use the multipurpose PSP cable I mentioned above for your phone as well as your reader.
You can buy the PSP cable at amazon for about $11:
http://www.amazon.com/Insten-2-1-Dow...dp/B000F1TNCA/
If your Palm uses the "universal dock" attachment, this eforcity cable at amazon is only 8 cents!
http://www.amazon.com/Eforcity-Charg.../dp/B000EG6QDK
And for 69 cents here is a USB wall adapter:
http://www.amazon.com/iPod-Travel-Ch.../dp/B000A2BLEC