If it’s $10 for a single board with free shipping, then the price is OK (soso). But these things only have maximal 6-bit IO (more like 4). If you do any USBGPIO, 2 bits must be used by USB.

The title of the smallest Arduino board doesn't go to just a single board — it actually belongs to an entire family: the Nano family. This set of boards comes in the smallest form factor Arduino ...

[Kaushlesh Chandel] prototyped a few projects on his Arduino that use an HD44780 Character LCD. Wanting to keep these projects in one piece, but not sacrifice his Arduino board, so he etched his ow… ...