Fry's Electronics offers a pair of JBL Loft 30 4" Bookshelf Speakers, model no. LOFT-30AM, for $49 with free shipping. That's a buck under our May mention and the lowest total price we've seen for these speakers. (It's a current low for a pair of these speakers by $101.) Each 100-watt speaker features a frequency response of 70Hz to 20kHz, 4" woofer, and 1" soft dome tweeter.
Update: Note that they are currently on backorder, but can still be ordered at this price for delivery when available.