Amazon.com: ASUS TF701T-B1-GR 10.1-Inch Tablet: Computers & Accessories
Here's the dock: Amazon.com: ASUS TF701T-DOCK-AD02 GREY/TABLET DOCK: Electronics
More here: Tegra 4-Powered ASUS Transformer Pad Infinity TF701T Goes Up For Sale In The US On Amazon
ExcaliberPC has it for $449: ASUS Transformer Pad TF701T-B1-GR 10.1" 32GB Android 4.2 Tablet - Gray (Tablet Only). ASUS TF701T-B1-GR
... and so does NewEgg: Newegg.com - ASUS NVIDIA Tegra 4 2GB Memory 32GB Flash 10.1" Touchscreen Tablet Android 4.2 (Jelly Bean) TF701T-B1-GR