With the 360 as a template, here is my guess.
You will not see many if any pop up for another 2-4 weeks. Then a few will trickle in every week to each store, but only the most dedicated people will get them (assumeing the employees dont buy to sell on ebay, and atleast half will). Then right after xmas, you will see some more pop up and if your lucky you will get one at a shop. Starting middle of January, early Feburary they will be pretty readily available, but still not on the shelf. But if your really looking for one, you will have one by then. Come March to April they will be on the shelf for anyone and everyone.
I think 2500 ea is a stretch. I dont buy the hype of the prices they claim to go for on ebay right now. I will believe it when I see it. That said, Id guess that 1500 is a safe bet for a true sale price on any that you dont buy direct from a store from now till xmas.
On a side note, I got my 360 on Jan 1st by walking into a Wal Mart at about 1 pm. I expected the would be gone, as I had heard in advance that wal mart would have some for the Jan 1 at all stores. I had been looking since the release day, and was following leads on the internet. I image there will be a ps3 tracker site, just like with the xbox site at the time. Id also GUARANTEE that Best Buy will get one more batch, and hold them for a add before xmas. Im also willing to bet that Wal Mart will have some on the 1st for a promo. Your far more likely to get one on the 1st, as alot of the kids will have them allready, and the 18-30 crowd will be to hung over to stand around waiting like they will do for the Best Buy special.
One last thing, I love my 360 and have no intention of getting the ps3. Ive never been a playstation fan, and I havent played the xbox360 more then 10 hours in 3 months. I do however have all my cds on the 360, and I use the music player daily as a great baby charm. When my little boy starts to loose his mind and nothing will calm him. You put that screen up, and hes locked in. And I get to atleast hear some decent music. If nothing else the 360 is worth the 300-400 as a multi disc changer. I have about 90 cds in mine, and havent had to load a cd in almost a year now.
Good luck on selling them, I do hope you get the 2500 ea, let us know and be hoenst. Id love to hear how its really turning out.