From their website it looks like after ASR was acquired by Energizer they restructured and got rid of the Burma Shave brand all together. They don't make Treet and Pal SE blades any more either - only Gems.
They have been going with that plan for some time. Energizer/Schick is rebranding Personna into three sales components which are beauty, medical and construction trades, and eliminating most of the old ASR lineup that was to them not profitable enough. You have to look under a different site for the other Personna products. http://personnablades.com/home.aspx