If you were looking for radio supplies in Omaha a hundred years ago, the Brandeis department store was the place to go, as shown in this ad in the Omaha Bee, November 24, 1923.

You could get a complete Radiolet crystal set, normally a $10 value, for only $6.95.  That included everything you needed to start pulling in stations, since it included the headphones and antenna.

And they knew that the secret of selling radios was to get the kids campaigning for a set.  So in addition to their normal radio department on the main floor, they were to be set up in the toy department on Saturday so that the kids could make sure Santa knew the family needed a radio.