Samsung T5 500GB USB 3.1 Gen 2 External Solid State Drive (MU-PA500B/WW) is on sale for $85 seems decent but probably not the greatest price ever as its the same price at Harvey Norman and Officeworks.
Cheapest Amazon price it has ever been according to CamelCamelCamel, it usually hovers around $136. It should be free shipping for everyone as its over the minimum spend.
.Performance of up to 540 MB/s, up to 4.9 times faster than external HDD
.Interface: USB 3.1 Gen 2 (Up to 10Gbps); Backwards compatible
.Durable: Shock resistant internal frame lets the T5 withstand falls from up to 2 meter
.Security: Optional password protection and AES 256 bit hardware encryption Compatibility: Windows 7, Mac OS X 10.9 (Mavericks), Android 4.4 (KitKat), or higher; Older versions may not be supported