Today, Nintendo updated the page for the offer, extending the cutoff to "midnight, Pacific Time on Monday June 20, 2011" -- we're contacting Nintendo to clarify if that meant last night or tonight. We tested the deal and have yet to receive email confirmation ourselves, but Nintendo's page says, "You will receive an email confirmation within 7 days to confirming we have placed your order." It also says that everyone who registered before midnight Pacific on June 20 will receive a CD.
Update: Nintendo informed us that the deal is in fact active until midnight, Pacific time, tonight. There's still time!