Adorama offers a pair of Polk Audio LSiM 703 Bookshelf Speakers in Cherry or Black for $649.99 with free shipping. That's $50 under our mention from Black Friday week and the lowest total price we've seen. (It's also the best deal we could find today by $850.) Features include midrange drivers, ring radiator tweeter, 6.5" mid-woofer, frequency response of 36Hz to 40kHz, and dynamic balance transducers.
Update: Specs corrected.