I just got an alert from the three dromedaries that the Simplehuman triple shower pump [amazon.com]
is down to its lowest price ever. I already purchased this a few months ago and have been generally happy with it so far. My only complaint is that the adhesive is insufficient for mounting if you'd like to avoid drilling into your shower wall. It fell the first time, but I purchased some more 3M double sided tape to cover all of the mounting surface, and it's been great ever since.