While browsing at Toys R Us yesterday, I was suprised to see some old stock. They had everything from the 2002 stuff (Rattler) on up to present stuff. I was surprised to see some of the old stock there thinking that stuff was long gone by now. The prices were the same, but perhaps if they don't sell they will do some discounts. I did notice that all Transformers were 30% off and they had a lot in stock at the store I went to.
I had a similiar experience about two months ago when I went to TRU in Hialeh, they had the 01 Night Rhino, the Conquest, the snowcat and the Rattler that were released upwards to two years ago. They also had a python patrol set that I picked up in a bargain bin. It ironic isn't it. They have all this old stuff that you thought were long gone, but finding a Cobra Infantry forces in TRU is like hitting the lotto.
My theory on why they are not discounting the TRU exclusive items is because they are just that, exclusive. They know you can't it anywhere else so they are willing to leave them on the shelf for a while. Granted, they discounted the MMC but that may just be because it was taking up too much space and it was pretty expensive to begin with.