Many comments are inaccurate. It is not the responsibility of supply (me) to provide ANYONE, regardless of rank, with items for personal usage. PFC Mullins stated as much in his initial posting that it's for his personal laptop. It is incumbent on each individual to purchase personal items themselves. I agree with coming onto a site like this for information on making a purchase but we should not be suggesting an illegal activity, even though it may have been an inadvertent suggestion.
Like MAJ Weiss suggested, the SCMs are great CAC Readers. If you would like a very nice portable one, check out the one below. It folds up nice and neatly into about the size of a thumb drive. I have one and carry it with me. These cost $17.99 but well worth it.