I was searching for something else and I saw this.
170$US
Possible op-amp rolling
Claimed 2.2 watts
Claimed 123dB SNR
1/4 inch + 3.5mm + 2.5mm balanced out.
Non-balanced: 1.1w @ 32 ohms / 160mw @ 300 ohms.
Balanced: 2.2w @ 64 ohms / 640mw @ 300 ohms.