Hey Beverly,
First I'd say the G4 is a bit older and w/ the introduction of Snow Leopard is no longer supported by Apple.
If you run that model G4 here:
http://www.mac2sell.net/
It will come back as worth $490 used and there are clean used examples of these around here for about $450.
Is there anyone you know who can help you find a newer machine. If you were my client I'd find a newer MacBook for you. You do need a laptop?
This person could also help you find a good used machine at half the price.
A brand new MacBook is selling for $999 at the Apple store.
It's a smaller display and the initial hardware warranty is 1 year. Purchasing Apple Care will run it to 3 years.
It will run the newest software and will continue to do so for some years.
If you had someone who knows Macs and you trust you could look at machines like this one for $750 (just for example):
http://flagstaff.craigslist.org/sys/1503073793.html
It still apparently has some Apple Care left on it's contract. You could actually verify this by running the serial number at the Apple Store to find out exactly how much remains.
Richard