Adafruit, a distributor of Raspberry Pi single board computers, has mandated that certain new purchases can only be completed with the use of two-factor authentication. The new requirement is due to reselling schemes that use bots to buy up the last of the products. Raspberry Pi chief Eben Upton told ZDNet that this kind of automated purchasing is typical when supplies are short, as opportunists try to profit from the situation by clearing the market, then reselling the products at a marked-up cost. Users intending to purchase “certain high-demand items” from Adafruit will now need to have a verified Adafruit account with two-factor authentication enabled.