Western Digital My Book 1TB External Hard Drive for Mac for $64.99. Here is a screenshot for your reference. Order online for in-store pickup to lock in the price and ensure availability. It is currently available at most Best Buy locations for in-store pickup (We checked 5 different zip codes). Note that it actually works with both Windows and Mac. For the technically inclined, you can always reformat it with NTFS as well. Most places have it for over $100.