I have the small....and it's not tiney tiny. The squirrels themselves are about 5 -6 inches long and the little tree trunk is maybe 8 inches tall or so. Those are guesses. It's a good size. I saw the large size in a store while on vacation and thought it was too big.
I don't have a link for you, but I bought ours off eBay using a BIN, and it was much cheaper than the store even with shipping.
Happy early birthday Stedman!