Radio Shack's 1986 electronic book

Here's a 1986 ad for Radio Shack's "Electronic Book," which connected to your computer's joystick port, and the interacted with software supplied on a cassette or disk. The peripheral cost $24.95, and new titles were $19.95 to $24.95 — so the hardware prices have increased tenfold (unadjusted for inflation) in 25 years, while media costs have actually decreased.

Radio Shack 1986