I've had a large and heavy 1960's power amp, preamp and tuner sent from Wellington to Auckland for around $50-60.
Full of vaccum tubes, and everything was perfect when it arrived back. Boxed the parts, wrapped the boxes in bubble wrap, and then boxed that.
This was through NZ post. Hopefully this helps!
Amiga 4000: Apollo Turbo 040, 128MB Fast, 40gb HDD, CD-ROM (needs internet)
C64: 1541U-II, MixSID, WiFi, LumaFix64
ZX Spec, A1200, CD32, MacPlus/SE, A500, BBC Turbo Master (NASA), 2600, Acorn 4000, VIC-20, IBM 5155, GameBoy