I backed them for 4x #solokeys V2. For a #FOSS project, they’re doing great things! I already have a V1, and am really happy with it. If you care about this kind of thing, they’re good quality and security like this, is worth the price of admission.
You can still get a #solokey V1 on their website if you’d prefer. Cheap and effective. Remember to grab two keys, in case you misplace; damage, or lose one.