Updating StubHub availability from yesterday (lined-through price on left is from my post of yesterday, price at right is from right now)
NLDS
Game 1 - 3,732 left starting at $74 2,561 left starting at $97
Game 2 - 4,919 starting at $63 4,624 starting at $73.98
Game 3 - 4,487 starting at $58 4,647 starting at $64.90
NLCS
Game 1 - 2,145 starting at $124 2,579 starting at $124.99
Game 2 - 1,971 starting at $109 2,448 starting at $120
Game 3 - 2,145 starting at $125 2,669 starting at $137
Game 4 - 1,858 starting at $148 2,403 starting at $149
World Series
Game 1 - 1,905 starting at $494 2,437 starting at $494
Game 2 - 1,828 starting at $477 2,375 starting at $477
Game 3 - 1,831 starting st $450 2,375 starting at $500
Game 4 - 1,821 starting at $500 2,369 starting at $584
Promising stuff, looks like there's legitimately high demand for playoff tickets. I've been watching stubhub too and I've noticed that Nationals tickets are more scarce than the other two division leaders (i.e. teams most sure of an NLDS appearance) and have been becoming more so.