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Best Buy [bestbuy.com] has ASUS USB-AC53 AC1200 Nano USB Dual-Band Wireless Adapter for $7.99. Shipping is free for My Best Buy members (free to join [bestbuy.com]). Otherwise, select free store pickup where available.

Amazon [amazon.com] also has ASUS USB-AC53 AC1200 Nano USB Dual-Band Wireless Adapter for $7.99. Shipping is free w/ Prime or on $35+.