There is a Super
Walmart near mile marker 13 on 192. Might be closer to 12 or 14, but it's in that general vicinity. We bought diapers there and the biggest bag of Pampers (with 84 in the size 4s) was about $19. This was two weeks ago. Everything else seemed pretty comparable to our home walmart too.
Our best find was rain ponchos for $3.50 that had Mickey and Pooh on them. The thnig I thought was crazy is that they had NO toddler boys shorts! Now, I know people in FL thinnk it's winter down there, but come on, they get tons of tourists who think 70 is tropical. We wanted to pairs of shorts to stuff in the diaper bag in case the kids got dirty playing in the dino dig at AK and didn't want to go back to our resort. No luck!