Please feel free to correct me if I'm wrong, but I believe the Large size is the same as the New Medium size (with base price of $5,200)....they just re-named the sizes (and the Old Medium size is now referred to as Medium with a base price of $4,700). In the past, I have seen a size boy larger than the New Medium/Large, (called Jumbo, perhaps?)...but I haven't seen anything released in that size in a while. Using @stulevialauren's list above:
Mini size measures 3.7H X 5.9W X 2.8D $3100
Small size measures 4.7H X 7.9W X 2.8D $4300
Old Medium NOW ALSO KNOWN AS MEDIUM measures 5.7H X 9.8W X 3.1D $4700
New Medium NOW ALSO KNOWN AS LARGE measures 6.9H X 11W X 3D $5200
All boys are seasonal and not all colors/styles are released in all sizes. HTH!