As I have been looking at the issue of having Core Boot on another laptop.
From the QUBES OS website someone has a converted Laptop for sale.
There is a place in github that has the method to PROM the the Lenovo X230, but not any other laptop. Lenovo X230 is a third generation Intel. I could buy a lower resource (less RAM, Less Processor) for almost a reasonable price. But I would still need to open it. Replace the small battery. Re-Do the thermal paste. Program the BIOS to Core Boot, although it has detailed instructions on the how to. Probably put the maximum RAM in it. I see a base machine for $250. or so on NewEgg.
It was suggested that besides trying to get my own, Lenovo X230 and do all the necessary things. I could get one of the more modern Chrome Books, which have Core Boot built in. Still, not really cheap in that one really need 4 GB of RAM, and more than 16 GB of SSD. Chrome Books usually have those components soldered into the MOBO. I don’t think I would try to solder a replacement. I did speak Dell about a Chrome Book (no affiliation with Dell, just I live in Texas and thinking they are a respectable computer manufacturer must be in the water.) Dell has a one set of Chrome Books that part of there business side. I am told there is a big difference in the quality of Dell manufacturing for business machines versus those computers built for masses. They have one Chrome Book, and I am not sure if those models have Core Boot, which are like $1600.00. So I did not investigate further. I could put my pennies together and try to snipe a refurbished ChromeBook from Dell. It was suggested that I could purchase a more minimal ChromeBook and boot from the SD card. Which might function.
This a bunch of folks worrying about the issue of finding a laptop with Core Boot.
https://groups.google.com/forum/#!topic/qubes-users/Qe01UkXdd1U
QUBES OS has a lot of interesting info about security. https://www.qubes-os.org/
Do let us know if you find something interesting.