I bought several calculators in the mid 70's and early 80's costing from around £30 to well over £100.
According to this:
http://en.wikipedia.org/wiki/Sinclair_Cambridge
Quote:
The Cambridge was extremely small for a calculator of the time:[3] it weighed less than 3.5 ounces (99 g) and its size was 50x111x28mm.
A major factor in the Cambridge's success was its low price; the Cambridge was launched in August 1973, selling initially for GB£43.95.[1] In January 1974 the Cambridge was priced at £32.95 (£29.95 + VAT) fully assembled or £27.45 (£24.95 +VAT) as a kit..
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Which sounds about right to me and given that my 5 1/2 day pw summer holiday job only paid me £11, that was a lot of money.