Hm, he may be a factory blank. They seem to range from $15 to as much as $55 depending on the mold. I'd love to be more help with a price, but I'm still learning about Peter Stone horses. All I know for sure is even though I'd love a body like this to play with in my studio, it's likely more than I can afford, lol.
Really nice find, though. I'm jealous.
~Shaliken