How much does this cost to the nearest dollar?

S.M.S.L SP400 Full Balanced Headphone AMP THX Pre-Amplifier Desktop Headphone Amplifier
Audio Section Inputs Balanced x1, Unbalanced x1 Outputs Balanced x1, Unbalanced x1, Pre-balanced output x1 Output Power Balanced 12W x 2 (16 Ω) 6W x 2 (32 Ω) 880mW x 2 (300 Ω) 440mW x 2 (600 Ω) Unbalanced 6W x 2 (16 Ω) 3W x 2 (32 Ω) 440mW x 2 (300 Ω) 220mW x 2 (600 Ω) SNR 133dB, A-Weighted Output Noise 1.9uV, A-

Price is $630.00
Price: $629.99