Update: BigBadToyStore has this for pre-order at a cost of $334.99 with a $50.25 Non-Refundable deposit and a June 2024 availability.
Megahouse is now releasing their Real McCoy line as the Desktop Real McCoy EX with the first being Goku and Gohan on a Bipedal Robot. These have a nice Toriyama design where he likes to draw the characters on machines like robots, bicycles, motorbikes, and cars. They should also include dinosaurs and dragons as well. Currently, no US based retailers carry this, but I will update when i find one that does. For now, check out the announcement on the official site below: