Hi, Rishi -
You can usually find retail OS 9 Install CD's in North American English at sites like these -
http://store.yahoo.com/hardcoremac/index.html - Apple Reseller
http://www.applerescue.com/
EBay is another possibility.
Regardless of the source, be sure to get a retail OS 9 Install CD - those are white, with a large gold 9 on them; the retail OS 9 Install CD's have a universal installer; model-specific Install CD's do not.
In case you need the updaters -
Article #75103 - Mac OS 9.1 - Download and Info
Article #120030 - Mac OS 9.2.1 - Download and Info
Article #75186 - Mac OS 9.2.2 - Download and Info
If you want to end up at OS 9.2.2, I'd recommend getting a retail OS 9.2.1 Install CD (there are no retail OS 9.2.2 Install CDs). Those include current versions of Apple's Disk First Aid and Drive Setup utilities, and would reduce the need for OS updates to one.
Note - if your PowerBook G3 is a FireWire model, it can not use a retail OS 9.0 Install CD; it would need a retail OS 9.0.4 or higher Install CD. Any earlier PB G3 model can use any retail OS 9 Install CD.