OfficeMax offers the Barnes & Noble NOOK Simple Touch WiFi eBook Reader, model no. BNRV300, for $79 with free shipping. That's the lowest total price we could find by $5, outside of the price below. (We listed it for $10 less three days ago, since expired.) Sales tax is added where applicable. The NOOK Simple Touch is 35% lighter (just 7.48 oz.) and 6% thinner than the original NOOK. It features a 6" 800x600 touchscreen greyscale E-Ink display, on-screen keyboard, 802.11n wireless (with free access at AT&T hotspots or in Barnes & Noble stores), 2GB internal memory, microSD card slot, eBook library viewing, nook Friends social networking, up to two months of reading time on a single charge, and more.
Of note, Target has it for $79.99 via coupon code "NOOK20" with free shipping.