樓主的預算是500啊。這部聯想倒是很值。$199.99包郵 Lenovo聯想 ThinkPad T420 14寸筆記本電腦 酷睿

http://cn.dealmoon.com/199-Lenovo-ThinkPad-T420-14-Notebook-with-Intel-Core-i5-2520M-REFURBISHED/460120.html

不在意翻新機的話。