k.a. on Twitter: "Lego 6970 command base. Comes with craft, buggy AND monorail. Very generous for a medium-ish sized set. https://t.co/LTqUdiUMia" / Twitter
Beta-1 Command Base : Set 6970-1 | BrickLink
LEGO Space: Beta I Command Base (6970) for sale online | eBay
Legoland Set 6970: Beta-I Command Base Review! | LEGO Amino