I remember Service Merchandise and Best Products . . . didn't Best used to be LaBelle's?
I remember S&H Green Stamp and Plaid Stamp catalog showrooms, too. One of these was in the basement of a Wieboldt's department store.
And . . . back when I was very young . . . I also remember a store to redeem Raleigh coupons. (Raleigh was a cigarette brand my parents smoked.)
As far as digital watches go . . . the first one I remember was the Hamilton Pulsar, an LED watch. Short battery life if you checked the time frequently. A little later on, the "Sensor Trilite" came out, an LCD watch with a tritium backlight. Pricey for its day, but it showed the time continuously.