seedsigner is good
if you get the parts for cheap. if not, it can cost 80 usd or more

i like the maix amigo which is a programming board like the raspberry pi
but it has a touch screen in a perfect format.
it has no wifi and no bluetooth which is perfect.
maix amigo is easy to use with krux opensource wallet which can be installed offine

i bought it from aliexpress for 48 usd