Are there similar kits still being made and sold today? It seems like it'd be easier and cheaper than ever to make kits that can do some very cool things, but I never see them where toys are sold. These things should be in every toy isle and museum gift shop.

Yeah I’ve had the same thought. You can get cheap kits but the instructions tend to be vague/machine translated from Chinese.

I think there’s a gap in the market for quality kits with good educational instructions - but I think the market size would be very small