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At Sotheby's comic art auction in Paris, a rare drawing of Astro Boy by Osamu Tezuka himself sold for €23,750 (which is $25,000 in American dollars).

[url]http://news.artnet.com/in-brief/sothebys-comic-art-auction-brings-in-4-million-275861/[/url]

Perhaps the sale's biggest surprise was a sketch of Astro Boy (c. 1980) by Japanese cartoonist and animator Osamu Tezuka, which more than quadrupled its €5,000 pre-sale estimate, selling for €23,750 (about $25,000). Tezuka has been described as the father of Japanese manga.

It's not the first Tezuka drawing to sell at an auction. Here are a few others that have sold in past auctions:

[url]http://www.artnet.com/artists/osamu-tezuka/past-auction-results[/url]

The drawing in question that sold in the auction in Paris was this one:

[url]http://www.sothebys.com/en/auctions/ecatalogue/2015/bande-dessinee-pf1555/lot.196.html[/url]

Here is the description translated from French (by Google Translate, so sorry for any grammatical mistakes):

A drawing of the huge Tezuka, that's especially rare to find. Almost impossible in Europe. Astro Boy is here drawn by the "god of manga" on a Shitajiki, a sort of sub-hand the size of a mouse pad. The character invented by Tezuka in 1952 is the first to be adapted as an animation for television in the early 60s Astro Boy is a superstar! Dedicated in Japanese, the drawing is one of the rarest pieces in this auction. It recognizes the effectiveness of stroke Tezuka. With a few strokes, he creates a memorable and recognizable character of all. On the back of the work face a tamper-proof certificate of authenticity in 2009.
black felt paper
26.5 x 23.5 cm

And here's an image of the drawing:

Sometime ago I posted a doodle of Tezuka's that was being sold on eBay. That one was a drawing of Astro dancing with Uran.