BEP sold about 55,000 in their 6th week.
Expect Gnarls Barkley to outsell them in total though - I think maybe around 100k more.
EDIT - Mikey beat me to it - I'm a bit slow off the mark tonight!
Interestingly this weeks 28% drop is the average so far from the 194k a few weeks ago.
the percentage drops are about:
39%,
36%,
9%, (from 76k to 69k)
28%.
So if the trend continues then just over 36k next week seems about right.