https://forgottenrealms.fandom.com/wiki/Calendar_of_Harptos

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A “factory seconds” framework 13 might fit your budget, and you get a laptop that is easily repairable and upgradeable. The 11th gen i7 version that starts at $500 is what I have been using for a couple of years now and still runs great.

They also have refurbished laptops, but those seem to start a little bit more expensive.

From the btrfs page on the archwiki

General linux userspace tools such as df(1) will inaccurately report free space on a Btrfs partition. It is recommended to use btrfs filesystem usage to query Btrfs partitions.