Sonos.com has Sonos Play:1 Compact WiFi Speaker (Refurbished Metallic Black) on sale for $99. Shipping is free.
Features:
1x Tweeter
1x Mid-Woofer
2x Class D digital amplifiers
802.11b/g WiFi (2.4 GHz)
10/100 Mbps Ethernet Port
Control w/ the Sonos app (iOS / Android / Windows / MacOS / FireOS)
Dimensions: 6.36″ H x 4.69″ W x 4.69″ D
Weight: 4.08 lbs
AC power supply included