Quote - Some say "tested on a PC" some say "Not tested on a Mac" I have accidentaly bought some items without checking and some work on a Mac and some don't. I wish people would be more specific and just say "PC ONLY" or "Won't work on a Mac" or "PC and Mac compatible." It would make my life a lot easier.

Looks like you'll be asking alot of vendors if their product works with a Mac.  When in doubt email and ask the vendor.