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As NateNate60 mentioned: USB Flash. I second this as a cost effective alternative to anything else. Corsair Survivor, Sandisk Exteme Pro and Kingston DataTraveler Flash drives to 256GB are cheaper than anything else and just as reliable.
Should you want to go the SSD route, the Corsair MX500 drives purchased with any external esata or usb chassis is the most reliable option for the price.
Storage vendors are rolling their hands in delight while systems administrators, particularly backup admins are cringing at the thought.