Where to buy OS 9 software

With OS 9 having been discontinued for more than 6-1/2 years now, there's very little new commercial software available anyplace that will run in it. The used-software market is where you'll have to fish for what you want. You might try posting a "wanted to buy" ad on your nearest craiglist.com.

LEMswap is another.
http://groups.google.com/group/lemswap

May be of some interest:

Mac Older Software Downloads

You might try pure-mac.com. They have a convenient list of downloadable software in many categories and many items are for OS9.

eBay is an answer, but

you may find the software comes with an old Mac or two, it'll still be pennies tho', just make sure you get the original disks and any licence keys, and

you may have to search for a few weeks, perhaps twice a week.

I've seen everything come up in the UK over the last 6 months while looking for a Quadra 800, 900 or 840AV in good condition. Don't ask.

Silent One wrote:
...OS 9 software...Logic etc...

Don't know about Logic, but I have an old version, I think v2.0, of Cubasis VST for Mac OS 9, Steinberg has a user forum for the Cubase VST 5.0 PC/Mac OS 9 audio/recording studio software here if you are interested:

http://www.cubase.net/phpbb2/viewforum.php?f=8&sid=32697c0b95ca78c5d610b67270fc4 a90

I am not sure if those older versions were released in a dual Mac/PC format like the current versions of Cubase are now, you might need to find the Mac specific version of Cubasis VST, not sure when they started shipping in the dual-format package, but my v2.0 is Mac only. Not sure if you can find those in stores or on-line anymore, may be hard to find. They require booting into OS 9, not Classic mode.

http://namm.harmony-central.com/SNAMM01/Content/Steinberg/PR/Cubasis-VST-2.html

Pangea still has some of their old OS 9 games available, they may require pretty high-end CPU/video cards:
http://www.pangeasoft.net/index2.html