New "True Heroes" (non Chap Mei) space exploration sets at Toys R US (inside Macy's)!
They range from $12.99 to $54.99 (roughly the same as the non- "True Heroes" branded sets are on Amazon).
They are made for the 3" figures that are included in the sets, but could most likely be modified to fit 3.75" figures if you gut the cockpit interiors.