Dell Card Blank
On my work laptop computer there's a built in SD card slot. Dell provides a card blank to protect anything from going into the card slot. The card blank device also blends in very nicely. Should you loose the card blank, you can get a replacement for the K2D98 part:
Yes, for only $16.16 you can get your computer safe again! No more sleepless nights thinking about how unprotected your laptop is. Personally I think it's a waist of money. You can get a 4GB SD card for about $5. What's more, the SD card is so common now a days, you might have some from an old camera that you don't need any more.
Don't pay the extra price to protect the SD slot, put in a SD card and you'll be just as safe.