Memristors for sale... I check every few months to see if you can buy one, and now you can! They're not on Digi-Key, yet, but at Knowm $220 will buy you a part with eight of the little beasties on it. Looking at the data sheet, they're still a little challenging to use. This part is aimed at researchers, so that aspect doesn't matter quite so much as it would if they were aiming at design-ins for mass-produced systems. Still – they're real!