Yah, I just reviewed all of Adobe's available products and they no longer seem to sell the RAW convertor separately.
If it makes a difference to you, when it was sold separately it cost $99. Sinxe you already own PS7 the upgrade price for PSCS is only $150 (I'm assuming your using a non student version or whatever discounted version they have).
So if you want it built into PS that bad you'd have to had paid $99 a few months ago anyway or you can pay $150 today.
Maybe you can find the old RAW version for sale by someone on EBay or something?