I use this $6 one. https://www.amazon.com/gp/product/B00OGPO3ZS https://www.amazon.com/gp/product/B00OGPO3ZS which I can confirm works with google account, gi

I use this $6 one. https://www.amazon.com/gp/product/B00OGPO3ZS https://www.amazon.com/gp/product/B00OGPO3ZS which I can confirm works with google account, github, dropbox. It is a buttonless design that activates upon insertion. While an interesting idea, the $4.50 board + $3 in smt parts equates to a 25% cost increase vs. the cheap one above, assuming you already have the tools/programmer. Long term durability of the one I linked is still in question, I've been using it since about Jan 1.