Chugger announced on Facebook that for the next 20 orders, they would
a) donate the profits to the 9/11 memorial
b) include a free replacement pump head.
When I just placed my order, there were still 12 orders left. (It doesn't look like many people have noticed or taken advantage.)
So if you've been thinking about ordering a pump, get off your duff and do it quick. (If your order number is 1306 or less, you got in on the deal.)