I always liked these IBM Thinkpad 760 series laptops, although they are getting really dated now:
http://www.ebay.com/itm/Vintage-IBM-Thi ... SwGeBXPz6QI used to have a few 760ELs, and had linux running on one.
Actually, the much newer T40 series is now fairly inexpensive:
http://www.ebay.com/itm/IBM-Thinkpad-T4 ... SwMmBV4UvXI liked the old Thinkpads, because they made a gazillion of them, and therefore there are alot around for parts, or just being sold cheap in general. Good docs availability, specs available, drivers available, etc.
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Check out my home-brew computer projects:
https://m.youtube.com/watch?v=EgXulWcfLKc-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-