Congrats! That's awesome. If I collected those cards I would definitely get that.
Personally I don't care for the cards as I find them too small. In fact, I even feel the standard "L" sized ones are a bit small, especially when its a group photo vs a head shot. I wish all H!P pics were in this postcard size:
Actually there are several mini sizes smaller than the L, as you see below, there's a small card size, a photo size that is a tad wider but not exactly as tall, and then another card size that's a tad wider. There are probably other variations so I wonder if all 3 of those small ones below would fit into your album...
There's even the huge 5x7" photos... but I'm not too worried about those as I only own about 5 of them, plus a 5x7" photo album would be really easy to find.