As promised only a few minutes ago ( l live about 1/4 of a mile from Best Buy) I just returned from Best Buy.
I was very easily able to preorder the PS4. I simply went to the Customer Service Counter, said "I want to preorder the PlayStation 4" The guy was like "Ok!" He got on his headset and asked someone "What is the SKU for the Playstation 4" And he typed in the number they told him.
It is a minimum of $25 to preorder the PS4. You can pay whatever you want down, as long as it is at least $25. I also asked if I could make "payments" on it, meaning, could I come in and continue to pay down my balance, they said you cannot do that. They used to allow that, but not anymore.
You pay what you want to preorder it, as long as it is at least $25, then you have to pay the rest when you pick it up.
Also, two of my former students (I teach 6th Grade) were there to return a broken Dual Shock Controller. When they heard what I was doing, one of them did the exact same thing. As the word of mouth spreads, the PS4 is going to start selling like hotcakes. I would get your order in very soon!