if you want to get a used mac, try craigslist or
http://www.retrobox.com
used pc's, some macs.... stock varies...
other than that, you could TRY to achieve pc-macness by using the various themes available (XP), and using flyakite's v6 software.... i have it running on a spare computer and it's the closest thing to a mac you can get on a pc... pretty sweet, though!
i'll be getting a 15" powerbook sometime this month, so i'm reeeaaaallly stoked about that.