Asus Essence STX II Sound Card in Kanata, Ontario for sale

Up for sale is my asus essence stx 2 sound card bought it only on June 16 this year everything is mint condition box packaging i have the receipt i paid $329 plus tax at canada computers.
Industry-leading 124dB SNR (signal-to-noise ratio) audio quality inherited from the revolutionary and widely-acclaimed Xonar Essence ST/STX
Ultra-low jitter with premium TCXO clock source
Clean and consistent power supply thanks to high-fidelity low-dropout (LDO) regulators and WIMA® capacitors for uncompromising sound
Top-notch headphone amplifier supports up to 600ohm-headphone impedance with additional gain for in-ear monitors (IEMs)
Exclusive op-amp swap kit includes three op-amps and tool for easy tone tuning Celebrated MUSES op-amps deliver true-to-life musicality
https://www.asus.com/Sound/Essence_STX_II/
http://www.canadacomputers.com/product_info.php?cPath=40&item_id=078180