Use MeritLine coupon code MLCK904PNL1
MeritLine has this Logitech S135i Portable Speaker with iPod Dock for $24.99, but use the coupon code and the price drops to $19.99. Sears.com has the same one for $60.
The speaker system supports all iPhone and iPod models via dock connectors, as well as other MP3 players via a 3.5mm jack. Shipping is free.