Every now and again
woot.com sells the 5th generation Amazon Fire tablet
(from 2015), and a couple of weeks ago it popped up for $16 + taxes/fees.
I bought one and it turns out that you can flash an unofficial older
version of LineageOS, which is still being maintained for this device, and
get a surprisingly good little tablet running 100% FOSS (well except the
bootloader depending on which Fire OS version it has).
I wrote up a short guide in case anyone else is interested:
https://gist.github.com/Juul/3f93655efb8d99b89a29168dd255b5a2
Beware that I haven't verified this procedure on the latest Fire OS
versions since the tablet i got didn't have the latest version and I didn't
want to tempt fate. From forum reports it doesn't seem like woot is
shipping tablets with the latest firmware anyway, but I can't say with any
certainty. If you get one, just make sure you keep the WiFi disabled until
the guide tells you to turn it on, to prevent it from auto-updating.
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marc/juul