Looking for a "couch laptop"

https://local106.com/post/214668

Lenovo ThinkPad T470 14" FHD Core i7-7600U 2.80GHz Webcam Backlit HDMI USB-C | eBay

(Lenovo T470 Laptop Core i7-7600U 2.80GHz. 14" FHD Display Max Resolution 1920x1080. 14.0 FHD LED. Backlit Keyboard. Original Lenovo AC Adapter is also included. UHS-I); Micro SIM; HDMI; 2 M.2 (WLAN/WWAN).

eBay
I was leaning thinkpad.

What about something like the Thinkpad X201? It’s not ultralight but it is quite small.

Other than that I’d probably say a Chromebook with a Linux install. Second hand they are quite cheap and can likely do what you are after. A lot of them have passive cooling which is nice for a couch device. I was able to install libreboot on my C201P quite easily and now it just runs a traditional Linux install

I writing this on my x201 on my couch. I love it, but it’s not a great couch laptop. It’s kind of heavy, runs hot, and has poor battery life vs comparables.
Yeah the heat would be what would make me hesistate to use it as a couch laptop but if OP wants something cheap I would say it’s an okay option