I probably shouldn't say this for fear of them not being there anymore by the time I get there,

but.... I just saw a few at the Eagan Sam's club the other day. I'm trying to remember exactly where they were... they were not on their own big stand like they were a few years ago, and I don't
think they were with the majority of the other gift cards - I want to say that if you enter the store, and go right, along the right side wall, past electronics and along where the mattresses are, there was a small selection of gift cards at the end of an aisle, and there were a few hanging there.
We were at the store looking at mattresses and I remember seeing them on that trip, hence thinking they are near that section of the store - it is still possible they were somewhere else, but I KNOW they are there somewhere.
ETA - the employees there RARELY know what you're talking about in relation to these cards, btw. I got the general impression that unless you happened to run across the person who stocked/shelved them, or a person who's already run into a Dis'er who actually found them, they don't really know what they are. It doesn't scream out at you that there's an extra $10, it just looks like a light blue cardboard gift card pack, with Disney characters in snow gear on it. Most employees aren't going to pay that much attention to the detail of every item in the store.
I'm planning on stopping out there after work tonight, I'll let you know if/where I find them.