That's a good question, being a disneystore that isn't in the disney park I would question how fast the magicband stock rotates so I wouldn't be surprised if the older style is still on the shelf since the new ones aren't that old and don't need to be rotated for battery yet.
If the ride photos are important, I would get some new ones otherwise the old ones should work just fine. If your going to buy some, I would wait until your at property when the selection is much more diverse to choose from. Your old bands will still function for anything you touch the band to make work it's just going to be a couple rides and their photo/videos where it won't work.
Thank you Accident! I think it will be more fun to let the kids pick theirs out at the park too