What the OP was trying to weed out, I think, isn't so much the dealer (he states hopefully

) but the distributer, who bought in cheap from Japan and now China (most often), added a good few hundred percent (quite often) before trade-pricing it to a retailer. Even now, how much or little do you think the spate of £300 - £400 active 'monitors' come into the UK for? I'm told around £60 to £75 and the dealer doesn't have a huge margin on them, which I understand is more in line with computer products than traditional 'High Fidelity' gear...
Back in 1975, a cassette deck selling typically for £120 would leave the factory for no more than £25. Dealer would buy it at around £85 to £90 back then if they bought in quantity.