Stay Two Nights at a US/Canadian Westin and get a $100 Amazon Gift Card (through May 13th)

I just noticed this ad in the Wall Street Journal today, but apparently it has been around a couple weeks.

Earn a $100 Amazon gift card after every two Westin Hotel stays arriving Sunday – Thursday now through May 13, 2010.

This offer applies only to Westin Hotels in the USA and Canada.

Must be a Starwood member to participate and each member may earn maximum 3 gift cards.

It doesn't appear expensive rates need to be used--the best availalble rate qualifies for the deal.

Register by April 30, 2010.