Your local Best Buy should have a 2-port Adaptec AUA-2000 USB 2.0 PCI card, which, according to XLR8YOURMAC.com, supports Deep Sleep and is Mac compatible. Read about USB 2.0 compatibility here, if necessary:
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www.xlr8yourmac.com]
Fry's, Office Max/Office Depot, Sam's Club, and other retailers will probably have USB 2.0 PCI cards that will work in a DA G4 PowerMac, but for a quick fix the Adaptec card would be my choice. I have a SIIG 4-port USB 2.0 PCI card in my DA G4/533 DP tower, and it supports Deep Sleep and is Mac compatible, for example, but you don't have the time to do an internet order.
Hope this helps. Merry Xmas!
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What's the difference between reality and fiction? Fiction has to make some sense.