Apple Store has the
refurbished Apple MacBook Pro 13.3" Core i5, MD313LL/A (Fall 2011) for
$929 with free shipping. Equipped with the proprietary Thunderbolt port with speeds of up to 10Gbps per channel. Includes Apple's 1 year warranty.
Amazon has it new for
$1000 with free shipping.
Dual Core Intel Core i5 2.4GHz, 4GB RAM, 500GB HDD
Intel HD Graphics 3000, FaceTime HD, SuperDrive, OS X 10.7
Clearly proprietary doesn't mean what you think it does.