Hmm, yeah, that's pretty much the standard size for favor boxes, but that definitely won't fit your smores!
Check out this seller on Etsy - this is where I got my favour boxes from and she has tonnes of different sizes and the best prices from what I gathered back when I was hunting down these suckers! The shipping was fast and the boxes are a
good quality. She can also customize an order dependiing on how many you need. HTH! *knuuuuuuuuuuuckle bumpity bump!*