so weird i have had 3 sets that could not be merged my DS one cant go to a target one or one bought in a cvs type place but i was able to merge the CVS on with a staples ones......my guess is they are all coded different in disneys system and only like kinds can be merged....so target my guess sells the most disney giftcards in the country probably more then disney itself they probably get them between 5-8% less then face disney might code them differently in their systems....who knows i stopped i have almost 1700 in cards from all over the place and will just use the old system of using them next time i will keep them all separate so i can combine easier.....this would not be a problem if target sold larger dollar amounts.....