Many reductions on docking stations,this seems to be a decent one.Worth a look at the others too.
Gear4 - HouseParty 5
HouseParty 5 is a fully "Made for iPod and iPhone" certified home stereo speaker. The HouseParty 5's exposed yellow drivers and backlit touch controls give this speaker a unique look to compliment its great sound. With a line in port, you also have the option to enjoy tunes form your other MP3 or MP4 players in excellent sound quality. The HouseParty 5 will automatically charge your iPod or iPhone while it is docked, so you don’t have to worry about running the battery down!