Someone asked me if I shred the Target cards.  To clarify, the cards are shredded after the buyer confirms the amount when applied to their Target mobile account and then releases the bitcoins from escrow.  But as long as the card is combined with the buyer's private card (Card #1), the physical card's (Card #2) number and access code are automatically invalidated and cannot be used.

Both physical and mobile cards are available in $100, $200, and $500 amounts.  The physical card option is delivered via certified mail with the scratch-off protection still intact.