In addition to its extensive record inventory, National Record Mart at THE MALL also carries a small selection of pre-recorded open reel tapes. These have been on the market for nearly 10 years, but are an esoteric medium, strictly for hi-fi fans.
Image from The Universal Music Group / https://www.discogs.com

The store has an even smaller selection of Stereo-Pak 4-track CARtridge tapes. These were introduced last year and are a car audio medium.
Images from Muntz Electronics Corporation / https://www.discogs.com