My colleague Sanjay Deshmukh discovered that PaperShow, the extremely useful pen-based presentation tool that I have recommended here at DePaul and beyond, will no longer be supported here in the U.S. This means that the dot-paper and other supplies will soon no longer be available to purchase. It may be possible to import from Europe, though.
If this is a device you use, I would recommend stocking up on supplies. Unlike the Livescribe pens, it is not possible to print your own dot-paper.
There are alternatives to PaperShow, but none of them are a true match: