I have been try to get my hands on one of the seemingly mythical Sharpie Liquid Pencils since I first heard of them, but the last I heard from Sharpie they were not supposed to be available until September 2010, and it is still August. Some people have reported finding them at their local brick and mortar Staples, OfficeMax, or OfficeDepot store, but I haven't seen any. I imagine that not all office supply stores have the patience of a video game store and keep a product off the shelf until the official release date.
You can find one seller on the Amazon Marketplace and one online retailer who seem to have managed to get their hands on an early supply and are charging odd prices. Of the big three, Staples, Office Depot, and OfficeMax, only Office Depot appears to be selling them online. The only reviews posted appear on Amazon's page, and some of those people got their products really early according to the time stamps on the reviews.
We immediately got on the phone with our favorite suppliers and had them check their stock and see what it would take to get us a few. They said they had them in stock, they had the SKU SAN1770244 in their system, ready, and able to be purchased. Sadly our interface into their system reported no-stock on the item even though a live human being said they had them in boxes ready to be shipped.
I'm not sure what is happening, but I assume that our supplier is just doing a better job of following Sanford's rules than a couple different retailers. So until I have a Sharpie Liquid Pencil in my hot little hand I'll just keep taking notes and making doodles with my blue Sharpie Pen and patiently waiting.