Hi,

For your information, HW1 hardware wallet is already capitalizing on parts of the U2F architecture by using the related USB connectivity that was introduced in Chrome for U2F devices. In fact, the team behind HW1 is the same one behind the Plug Up U2F Security key and smart card protection technologies are mostly the same.

So, if you are looking for a secure hardware wallet under 20$, you can buy HW1 USB smart card hardware wallets here :
https://hardwarewallet.com (Two units with shipment to USA = 0.101 TC / 38$)

Regards
--
Fred