How much does this cost to the nearest dollar?

RCA to Headphone Amplifier HiFi RCA to 3.5mm Headphone Amp Stereo Audio Gain Support Impedance Headset
RCA Input and 3.5mm AUX Output Two RCA (R/L)input, plug and play. Help you to pick the music sources from music device to your headphone. Build-in circuit greatly improved the music quality. Not just like the other RCA to 3.5 mm headphone adapter. HiFi Headphone Amplifier Build-in Amplifier chip to improve sound quality. THD+N = greater than filter noise. High impedance headphone support Support most headphone in the market, from 32Ω to 600Ω headphone. Volume Adjustable On-board a volume adjustment rotary knob. Greatly Improve The Quality Of Music On-board enthusiast components and best circuit

Price is $41.00
Price: $40.99