From the Toys Section:
In the days running up to the release of Snow Leopard, Amazon has dropped the price of Snow Leopard to $24.99 and its family pack (5 licenses) of Snow Leopard to $43.99. If you’ve already ordered Snow Leopard from Amazon, don’t worry, there is a price garantee and the difference will be deducted from your bill. Happy shopping. If you haven’t ordered…Click here. Also Snow Leopard Server and Box Sets have been dropped up to $55.
Edit: This is a bit of a trick because dropping it below $25 makes the shipping go to $5, bringing the cost back up to the original price, unless you pad your cart with another purchase of $.01 or more. Good way to get someone to buy something cheap.