Morely's (sp) is my favorite to the extent that I keep their number in my phone on speed dial: 8777 8888.

I've written about it several times on FT in the past.

As far as costs are concerned, ball park:

-door fee = y158
-body scub = y58 + another y30 for the sea salt scrub (they also several other exotic scrubbing products including a beer/milk mixture)
-cupping = y88 (depends on the number of cups)

There are MUCH cheaper places to get massages in Beijing, but I like to treat myself to Morely's on occasion; the oxygen room is particularly pleasant.

I guess will have to agree to disagree about the effectiveness of cupping.