Amazon [amazon.com] has Fender Mustang Micro 5W Bluetooth Headphone Guitar Amplifier on sale for $84.99. Shipping is free.

The Fender Mustang Micro Headphone Amplifier features 5 watts, 6.25Dx6.25Wx2.12H inches
The Mustang Micro is an all-in-one personal headphone amplifier with onboard DSP, making it a perfect choice at home or on the go
Small but mighty, it packs 13 amp models for a wide range of clean and dirty tones and 12 effect combinations with parameter modify control
Bluetooth audio streaming with audio/video sync lets you play along in real time
2 Year Limited Warranty: Fender amplifiers are designed for players and built with unmatched quality, down to the last screw—Fender warrants this amplifier to be free from defects in materials and workmanship for two (2) years from original purchase