I was looking for 2nd SSD as gaming drive. I found this low price SSD - 2TB 2.5" SATA SSD from Silicon Power
Silicon Power Ace A55 2TB SATA SSD, Up to 500MB/s, 3D NAND with SLC Cache, 2.5 Inch SATA III 6Gb/s Internal Solid State Drive for Desktop Laptop Computer
Some other shops have at $118.00, but it's not free shipping - if you have them locally, then this is a better deal.
MSY - Link
Umart - Link
MWave - Link
I don't suppose you can make this into a portable SSD? If it can what kind case this would need? Price looks good