3DS sold 207,000 units in the week of its price drop, Nikkei reported today. The figure covers August 8 through August 14.
The site sources a market research firm without giving the name, but it's presumably Enterbrain.
This sales figure tops the 206,000 unit sales for the platform in the second week following its launch earlier this year.
(Note: The Nikkei report actually says "Nintendo DS" sales were 207,000 units. I'm writing under the assumption that they made a typo.)