According to a Logic Users Group source, there are still a few 1.24GHz, dual processor machines available that still allow you to boot into OSX. For those who don't already know, Apples new OSX system does not support VST under Logic Audio but uses their new Audio Units format (so far there ain't too many converted plugins), there's still a fair few of us who like to have access to our VST plug-ins. The usual fix is to boot into OS 9.x and use OS 9 savvy apps. The bad news is that the new range of Macs don't allow you to boot into anything other than OSX unless you use Classic mode - a way to run OS9 within OSX, making a whole bunch of unsupported VST plugins redundant.
Apparently though, due to the slow availability of an OSX version of Quark desktop publishing software - used by most of the magazine industry (and a large proportion of Apple buyers) Apple are still letting a few 1.25GHz dual processor OS9 capable models slip out.
Only available from the Apple Store, click on G4 Systems then look for OS8 Systems.
Note: These are not the latest models and do not include Firewire 800 or Airport - however they ain't too shabby!