Lots of you have asked, so... I found the panda backpacks last year at WalM*rt. I haven't seen them this year, though.
Kind of a cool God story about the backpacks. I had gotten one during the summer for Zoey. In the fall, we found out that we were going to be able to get Kate as well and I went back to WalM*rt to see if they had any more backpacks. It had been a summer item and they were all gone. I was so bummed. Before leaving the store, I headed to the clearance aisle. I spotted a few items from the panda product line. I breathed a prayer that if there was another backpack, I would be able to find it. A quick perusal led to nothing, so I started to dig through the pile. At the very bottom was another panda backpack! I wrote their names on them with a Sharpie marker.
God does care about the 'little things!' :)