$300 connector sets for speakers
$100+ per foot for 6ga speaker "wire"
Stones, that enhance sonic purity when placed on top of the cabinet $500,
4 gauge power (mains) cables for the ultimate sounding 9 watt triode amp - (nobody told them the power transformer was wound with 26 gauge)
electrolytic filter caps with new label material and ink for the printing on the label, that doesn't "interfere" with strong magnetic field surrounding the cap

:-P