I think we might see more of this happening as people clear out their attics and discover boxes of inventory previously stashed away perhaps by a family member who originally worked in the retail laserdisc sector.
In some ways its a miracle since I would have expected unsold stock that didn't sell even when discounted to be sent back to the manufacturer - that's usually what happens with music releases, but perhaps it wasn't possible with laserdiscs.
The odd thing about RAD is I don't think anyone would have assumed it was a going to be a big seller when it was first released to pre-order so many copies in advance. The fact so many remain unsold even when discounted confirms this.
In addition the whole BMX thing had been done several years earlier with the movie BMX Bandits released in 1983 starring the then unknown actress Nicole Kidman
BMX Bandits (1983) [SF078-0040]. I'm surprised there aren't more people chasing this original BMX movie rather than RAD which is pretty much a copy.