My local Sam's Club has the Black Segway Mini Pro for $399. I tried doing a search for it on their website and looks like the item is no longer listed. I didn't snap a picture yesterday when I was there but I plan on going back to buy two so I'll post a receipt later.
Receipt uploaded. Snagged one new at $399 and one open box at $319.01. Used one had 27 miles on it. Wheel cover has some scuffs but other than that, rides perfectly.
$599 on Amazon.