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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by nosuchthing on Monday June 15, 2015 @10:25PM (#9723468)
Price history is interesting [1], I'll take a guess that information of Hagoromo discontinuing this product went viral in January.

[1] http://camelcamelcamel.com/Hagoromo-Fulltouch-White-Chalk-72...

Re:Mathematicians Are Hoarding a Type of Japanese Chalk by anigbrowl on Tuesday June 16, 2015 @12:19AM (#9723794)
Oh my goodness what a wonderful site. I wanted to make something like this years ago and even registered a domain (buyitwhen.com) but everyone I explained the idea to just laughed at me and I didn't really know how to get started on it. Who's laughing now? Well mostly the people who are monetizing this thing but I am laughing along with them in an I-knew-it-would-work fashion. Thanks for bringing this to my attention.