Apple does still offer the 9.1 update for download, but not through Software Update (there was a recent thread about this); you have to go search their archives and I don't have the URL handy, sorry. 
To get to 9.2.1 or 9.2.2 (both of which are free) you need to be running 9.2, which means a CD. The OS 9 CD distributed with the last OS 9 eMac G4 will boot any Power Mac capable of booting OS 9, and has 9.2.2, so that's the way I'd go. They turn up on eBay now and then.
The ORiNOCO card requires separate drivers.
To get to 9.2.1 or 9.2.2 (both of which are free) you need to be running 9.2, which means a CD. The OS 9 CD distributed with the last OS 9 eMac G4 will boot any Power Mac capable of booting OS 9, and has 9.2.2, so that's the way I'd go. They turn up on eBay now and then.
The ORiNOCO card requires separate drivers.