RefurBees offers the refurbished 2.9-lb. Lenovo ThinkPad X1 Carbon Intel Haswell Core i7 2.1GHz 14" Laptop for $899. Coupon code "LTX5" cuts that to $499. With free shipping, that's $1,400 under the lowest price we could find for a similar new unit. It features an Intel Core i7-4600U 2.1GHz Haswell dual-core processor, 14" 1600x900 LED-backlit LCD, 8GB RAM, 240GB SSD, 3-cell battery, and Windows 10 Pro 64-bit.

Note: A 90-day warranty applies, but it's unclear who backs it.