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Adorama offers the iFi Retro Stereo 50 Integrated All-in-One Vacuum Tube Amplifier for $999 with free shipping. That's tied with our mention from last May and the lowest price we could find now by $600. It can connect with Bluetooth and USB devices, features 4xEL84X and 2xECF82 tubes and a 10Hz to 80kHz frequency response.