A DealNews exclusive! Yugster offers the Linksys Mini Dual Band 802.11ac Wireless USB Adapter for $29.97. Coupon code "DEALNEWSACWIFI" cuts it to $27.97. With free shipping, that's $1 under our mention from last week and the lowest total price we've seen. (It's a current price low by $11.) It supports up to 128-bit encryption and up to 430 Mbps throughput.