That's right, in the month of August we'll see the 3DS price drop from $250 USD to $170 USD. Such a big drop so early in the handheld's lifespan is pretty unheard of. I can't say it's unwarranted though. It's not like these things were flying off the shelves.
This sounds like a long-shot attempt by Nintendo to gain some traction with the 3DS before the PS Vita leaves their asshole in ruins. Will this finally get me to buy one? No. Hopefully the price will have dropped again by the time some actual games come out.