Urginea maritima (syn. Drimia maritima) Bloom from October 7th, 2011.
I found mine at Lowes, last November. It was a giant, unmarked bulb - orphaned from it's display - which had been taken down and trashed. None of the employees had a clue what to call it, or how to price it. I got it for 5.99 - the price of a potted bulb of another type (daffs?) they were also selling at the time.
One of the other customers said 'Giant Squill,' so when I got home, I looked it up.