You can find these models and specialized replacement parts at several major retailers: Boombox Buying Guide - Abt.com
Before purchasing, check these specifications to ensure the device meets your needs: buy boombox online
If you have physical media, ensure the unit explicitly lists a Top-Loading CD Player or Cassette Deck . Many modern "boombox style" speakers are Bluetooth-only. Where to Buy Online You can find these models and specialized replacement
For outdoor use, ensure an IPX7 or IP67 rating , which guarantees protection against water and dust. JBL Boombox 4
JBL Boombox 4 . It is widely considered the most powerful portable waterproof speaker, offering a massive 40-hour battery life and a rugged IP68 design that floats.
Anker Soundcore Motion Boom . Priced under $100, it offers an IPX7 waterproof rating, 24-hour battery life, and surprisingly clean sound for its size.