> They don't know that in 1970, in today's money, a fridge was ~$4000, a burger and fries was $17, and a typical dress was $350.

The Internet Archive claims to have Sears Catalogues from many years including 1970. If we check out Spring/Summer 1970, we can see that they actually have the first 33 pages of a catalogue that prominently advertises "index begins on page 391".

Disappointing.

That said, a women's dress from those first 33 pages costs $11, or about $100 in today's money.