Amazon has the SanDisk Extreme 1TB External USB C Portable SSD for $135.99 (regularly $249.99) with Free Shipping for a limited time. Adorama, Best Buy, and B&H Photo also have it for the same price for a limited time.
The rugged SanDisk Extreme Portable SSD delivers high-speed transfers with up to 550MB/s read speeds. The SanDisk Extreme Portable SSD is IP55-rated, which means it’s built to withstand water and dust. It is also certified to stand up to 2-meter drops. Designed to work with both Windows and Mac, the SanDisk Extreme Portable SSD is equipped with a USB 3.1 Type-C connector and also includes a USB Type-C to Type-C cable and a Type-C to Type-A adapter, meaning it will work with the PCs and Macs of today, tomorrow and yesterday.