Here's where I was getting DP, but at $5.20/can, not the 6/$25 price.
http://store.interautopartssd.com/index.php?main_page=product_info&cPath=1&products_id=10
(I checked to see if there was something saying I shouldn't post a link to non-parts or services vendors, but if there is, would someone let me know?)