There are a ton of different raspberry pi laptops. If you are looking to buy one, here is what you first need to know. Raspberry pi laptops generally cannot use Hats and don’t have batteries, so they have to be plugged in. They also have different OS’s that you can use instead of the traditional. Here are my selections for the best.
#1 pi-top
Pi-top is a raspberry pi That can be a laptop, tablet, robot, drone, and a ton of other things. It is meant to help teachers teach robotics and can be sold in 6 or 12 packs.

#2 Crowpi
This is another educational kit, but is more meant for personal use, not classroom teaching.You can get it with or without a raspberry pi. It costs different depending on what you choose.

#3 SunFounder RasPad 3.0
This is not exactly a laptop. It is more like a tablet. It has a built in raspberry pi 4b and comes with a built in battery.It can also be used for 3D printers and such.

#4 Pidock 400
The pidock 400 is a case for a raspberry pi 400 that turns it into a laptop. Just plug in all of the cables and It is ready to go.

That is all on finding pi laptops! I wish you good luck on your search!