Purple mattress. Don't remember what I paid but it was discounted because it was open box. Best sleep I've ever had and no waking up to back pain. I even bought a Purple pillow and rarely have neck pain.
Raspberry Pi. I got one before prices shot up. If I didn't have one already I'd go with one of the cheapest alternatives. I haven't done anything super crazy like a doorbell cam or magic mirror but it's been a ton of fun.
Similarity to the Pi my favorite laptop purchase has gotta be my Acer Aspire One netbook. It's noticeably slower than any other device I have but I'll still use it because I just love the form factor. Super light and easy to use anywhere and unlike a tablet it's got a built-in keyboard, several ports, and runs Docker (seems like it's possible on Android but very laborious).
What do you do with your pi? I bought one awhile ago to act as a streaming box for my non-smart TV, but for some reason I can't get the Widevine for DRM to work anymore so I'm not doing anything with it now.
I mainly use it for Pi-Hole, Torrents, Bastion host, and VPN (access from outside the home). I have a beefier server too but I guess I enjoy the novelty of a tiny server. Not using GPIO except for a fan but I guess I'll get a display for it someday.
Oooh I still have my AAO lying around in a drawer somewhere... What kind of stuff do you use it for? It was the device that introduced me to Linux, back then. Never used Windows again, ever since.
I use it just like a normal laptop. It's slow but it's not that noticable using a CLI. AntiX has done a great job revitalizing it (used Lubuntu before but it got way too slow). I would also recommend WattOS.