* Amoeba Music: Amoeba Music is a popular record store that sells a wide range of music, including audio cassette tapes.
* eBay: eBay is a great place to find used audio cassette tapes.
* Garage sales: Garage sales are often a great place to find old audio cassette tapes for a great price.
* Thrift stores: Thrift stores often have a selection of audio cassette tapes that have been donated.