I have used other displays from BuyDisplay but not their larger panels, however they have a 1024x600 10" panel for <50$ which should work, if you can live with that resolution.
I would be perhaps tempted to instead look for an old Android tablet. If you could get a 2013 Nexus 7 or some 10" tablet with a decent screen it might be a cheaper and easier way to do it. USB power + either some Android app or depending upon the device you might be able to run a different Linux distro on it. Looks like the Linx 10 goes pretty cheap sometimes too.
Thanks for the link! I want something for my desk, so I can try using my old Nexus 4. Maybe I can live with the 5" display since it won't cost me anything
http://www.buydisplay.com/default/10-1-inch-raspberry-pi-scr...
I would be perhaps tempted to instead look for an old Android tablet. If you could get a 2013 Nexus 7 or some 10" tablet with a decent screen it might be a cheaper and easier way to do it. USB power + either some Android app or depending upon the device you might be able to run a different Linux distro on it. Looks like the Linx 10 goes pretty cheap sometimes too.