Search eBay, but it if Dial-up Modem is needed, might search for one of the two original Saucer Apple Base Stations, which had Modems in them.
* Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
minimum system requirements
* 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
* DVD drive for installation
* 9GB of available disk space (I say 30GB at least)
Classic/OS9 Apps no longer supported.
May be available from Apple again...
Trouble is Apple no longer sells it, check eBay & such for the Retail version, not the Gray Discs...
There are workarounds if the 867MHz CPU is the only hangup...
List of Applications Not Compatible with Leopard...
I bought this modem for a friend with a new Mac notebook but who is stuck on dial-up:
Works fine, and even OS 10.4 should automatically detect it.
I recently signed up for FreedomPop.com. http://www.freedompop.com
FreedomPop provides 500meg of free 4g cellular data per month! You do need to buy their wireless device at $39. Your machine needs wifi capability. There are ways of getting bonus megs. One gig of addition data costs $10 per month. I used about 15megs per hour of lite internet surfing.
When signing up, you need to be careful with your selections. On some screens, the free option is a small link below the large button. FreedomPop employs a Pavlovian Dog < Operant conditioning > thing of getting you used to clicking on the large button then they change the large button to a paid add-on.
Once you setup your account, you need to go to your account options screen to turn off automatic paid data download once you exceed your quota.
The performance seems a little slower than my DSL connection.
Get it before they go broke.