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Guitar Center [guitarcenter.com] has Mackie MC-50BT Wireless Headphones w/ Wide-Band Active Noise Cancelling on sale for $ 49.99. Shipping is free.
More info regarding the iP series is available on the Mackie website: http://mackie.com/products/ip-series
SPECIFICATIONS
Frequency range (-10 dB): 45 Hz – 20 kHz
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more details on the rebate [mackie.com]