I pre-ordered the PX500 from Amazon when it was mistakenly listed at $59.99 and they cancelled the pre-order (Of course this was a huge mistake). This seems more reasonable so good luck to everyone who orders it.
I can confirm that the price is $9.99. Get it while it's hot! There seems to be a pricing error on the Tactical Enchancement pack as well however it is more expensive at $14.49 it should be $1.99 so I would hold for them to correct that price.