Lower demand and high supply have led to a rapid tumble in solid-state drive (SSD) prices before Prime Day. Even before the big sales began, SSDs cost much less. A 1TB drive that might have been $100 during Black Friday is now often found for around $80 (or 20 percent lower than before). And during Prime Day, those prices have tumbled even further, slicing yet another $20 to $30 off the price. It's a great time to pick one up if you've been wanting to expand your storage!