CSV storage InnoDB?

Hello all,
Quick question.
What is the best way to store a comma separated list of discount codes  
in a InnoDB?
Text, varchar, blob, ? I want to be able to store discount codes  
offered to users in their profile, in their cart, etc.
So I am thinking of storing the codes as a comma separated list that I  
can then refer to, add to or remove codes from.
The codes will change every once and a while and they list of codes  
may be rather large after say a year,
so I am shying away from an enum() or anything like that.

Any help/pointers is greatly appreciated.

Best,
Karl


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