cracked cds

I carry my lnx-bbc card in my wallet and find it to be very useful.  The 
only problem is that the cd tends to crack after a short while.  Does anyone 
know if there are wallet sized blank cd-r's that are less brittle than the 
usual cds?  It would seem to me that someone could make cd-r's using the 
same plastic they use for credit cards.

I found one site that sells "flexible cd's" but they require a special 
non-flexible case before you can use them.  Does any one have any ideas 
about this problem?

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