This Tube Amp with Bluetooth 50-watt Stereo Hybrid and Line Output [monoprice.com] is normally $199 and is well reviewed. It is currently 10% off (179.99) and the masterpass code works (MASTER50). Bringing your total down to $129.99 for a tube amp.
Currently $199 on Amazon.
Requires Masterpass checkout, but can use any type of card.
This deal ends today.