Wireless speakers
Bluetooth and Wi-Fi speakers for the kitchen, the garden and the beach. Sonos and Bose charge the most for the big ones, but small rugged speakers from JBL and Ultimate Ears now fill a room and shrug off rain.
Cheaper alternatives

Bose SoundLink Max alternatives
Three smaller, cheaper speakers. None fills a garden like the Max.

Sonos Roam 2 alternatives
Three cheaper portables that outlast the Roam 2. You lose Sonos multiroom.

Marshall Acton III alternatives
Swap retro looks for Wi-Fi, a battery or a waterproof build.

Sonos Era 100 alternatives
Cheaper, portable and waterproof: three ways to swap the Era 100.

Sonos Era 300 alternatives
Keep Sonos, go retro, or go portable, all for much less.