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Costco [costco.com] has for their Members: KEF LSX II LT Wireless Bookshelf Speakers (Pair; Black or Green) for $399.97. Shipping is free.

Specs via KEF: [kef.com][LIST][*]Uni-Q driver array (per speaker): 19mm aluminum dome tweeter, 115mm magnesium/aluminum alloy cone woofer[*]Frequency range (-6dB): 49Hz–47kHz; frequency response (±3dB): 54Hz–28kHz