My guess:
A1200 PAL rev 1d3 - $75
kickstart 3.0 - $1
UK keyboard layout - $0.5
ATX to Amiga PSU adapter - $5
ATX PSU with cable (selectable voltage 110-240v) - $0.1
IDE 44 to 40 pins adapter - $5
4GB Harddrive - $5
3COM 3C586 - PCMCIA ethernet with cable/dongle - $15
Newtek Digiview Gold - Video digitizer - $5
GVP DSS+ - Digital sound sampler - $5
Datel Midimaster - Midi interface - $5