Groupon currently has this Altec Duo Charging Dock and speaker w/remote for $40 with an additional $5 for shipping. This will charge 3 devices at once! This is normally $99, so you save 60%! Check it out here to read the fine print and all the details.
Please note that I do not personally have one of these and I did not research them to see what kind of reviews they've got. Doing a little research is definitely my suggestion!