Day 19 of posting Gunpla

No idea. Bandai has announced price increases on various kits (varies, but most around 10%), so maybe that's affecting Sazabi.

Stuff goes in and out of print all the time. Once stock starts to run low, reseller prices go up. When there's a reprint, prices come back down. And as the other use mentioned, Bandai also announced some price hikes. If all of the big retailers have something at the same price, my guess is that it's the latter. If the big retailers have spotty stock, it's probably the former.