I see you're in the UK...
dabs.com has the Lexar 4Gb and 8Gb CF cards listed:
http://dabs.com/uk/ProductView?quicklinx=38LS
http://dabs.com/uk/ProductView?quicklinx=38LX
and also the Kingston 4Gb:
http://dabs.com/uk/ProductView?quicklinx=3GMJ
I think the Kingston may be Type I, while the Lexars are Type II.
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Axim X50v | 4Gb Lexar CF | 2Gb ATP SD | Think Outside IR Keyboard | Boxwave Anti-Glare | PDA Panache Stylus | Krusell Horizontic Premium Case + Wrist Strap | Sony MDRQ66 Headphones with retractable cord...and loads of software 
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