Amazon [amazon.com] has 4" Mackie CR4-XBT Multimedia Monitors w/ Bluetooth on sale for $101.10. Shipping is free.
Product Description: 4" Polypropylene-Coated Woofer 0.75" Silk-Dome Tweeter 50W Amplifier All-Wood Cabinet Custom-Tuned Rear Port Specially Designed Waveguide Bluetooth, 1/4" TRS, and RCA Inputs Front-Panel Stereo Headphone Output Includes Connection Cables