How much does this cost to the nearest dollar?

Douk Audio U5 Headphone Amps, Mini Fully Balanced Amplifier for Home Desktop PC XLR / 4.4mm Headsets, DC 5V
Fully balanced headphone amplifier Adopting fully balanced amplifier circuit and innovative circuit design, the amplifier circuit of U5 always works at a high voltage of 24V even if input DC 5V, with wide frequency response extension, excellent transient response, excellent purity and transparency, and good dynamic range. Easily to drive low or high impedance headphones For a total power output of up to 1400mW under a 32Ω load, U5 can easily power headphones with any low or high impedance Volume knob allows you to smoothly adjust volume without any undesirable noise nor any channel imbalances. Pure analog design to reproduce music truly Pure

Price is $57.00

Price: $56.99