Hi Mike_Amiga
As i just got my self a nice kick ass mac, I might be able to help have you tryed:
Micro Anvika
www.microanvika.com i know they sell alot of mac things
Gordon Harwood
www.ghc.co.uk and yeah they are the same lot that used to sell amiga stuff, I got my mac from them.
Analogic
www.analogic.co.uk and yes the same that do amiga stuff
computer warehouse
www.cwonline.co.ukhope this helps, if u need more help just ask I am always around.
Regards
Antonio