Tapedeck.org
Remeber cassette tapes? If you’re a child of the 70’s or 80’s then you definitely will, children of the 90’s perhaps not so much. Anyway, Tapedeck.org has a great collection of images of old cassette tapes and you can even sort by brand, playing time and quality (I always liked BASF tapes myself).
I always thought Memorex had the best sound quality.