The only other main collectable items I go for is anime DVD and Blurays. Here is My Astroboy 1980's Deluxe Edition. Don't know if you would class it a Steelbook.
The entire 51 episode series across 10 DVDs, plus an exclusive BONUS DVD which includes the following special features;
• Original Japanese Episodes
with English Subtitles:
#1 The Birth of Astroboy
#2 Astroboy vs. Atlas
• Original 1960s Episode Sample:
#1 The Birth of Astroboy
• Alternative Angle Opening
Storyboard Sequence
• Original Character Art Gallery
• Textless Opening & Closing Sequences
Featuring Song Subtitles & Original
Japanese Songs
• Original Manga Cover Artwork Gallery
• Merchandise Gallery
• Japanese vs. English Episode Comparisons
(Deleted Scenes) Featuring Exclusive
Footage From the Original Japanese
Episodes with English Subtitles
• Character Profiles
PLUS an Exclusive 24 Page Booklet