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From Transwiki

Found a shower board: As I have been researching where to get large white boards online I came across the idea of a shower tile board. GREAT. I had no luck in locating anything online at Lowes, Home Depot, Menards, or other searchs etc. I called our local builder supply company, Builders Mart, and they were quick to help. They even deliver free. We are planning to attach to our cement block walls with Masonry (tap cons-spelling?) screws. The cost for the 4 x 8 ft sheet is $16.00 each with free delivery. So as the readers are searching for info online, I suggest call a building supply store for help. (Our area is dry but if moisture is a problem, suggestions for a moisture barrier (plastic sheeting)for protection could be used).

[edit] Another User May 2009

I read many people's accounts of finding this shower board cheap at Home Depot. I am planning on using it as part of a robotics competition game board so I don't need anything fancy. Many of the people on the web even gave the SKU #253-540 but when I went to www.homedepot.com I did not find any item with that number. I called Home Depot, and after being transferred multiple times I finally found it in the lumber department for about $14. The SKU number (as of May 2009) is 346-428 and the woman on the phone called it "Thrifty White Panel-Board." I hope this helps anyone in my situation.