That TKB boxset sold out before release in 2001, so it's the most expensive thing by far. I'd mainly want it for The Golden Bat (1971) disc and the miscellaneous recordings disc.
A rare CD released in 2005 that features recordings of early Tokyo Kid Brothers including 6 recordings from The Golden Bat and 5 recordings from The City.
I just bought a copy. The most I've ever spent on a CD. I'll likely share it here when it arrives in a few weeks (if shipping is successful).