It was reported on this FW thread
that Western Federal Credit Union sent postcards of this promotion to households in Fairfax County, VA. The postcard provides the following link to this online promotion page
Due to the postcards and the fact this promo page isn't mentioned at the main western.org website, I'm considering this a "your miles may vary" bonus. The promo page doesn't mention it being targeted.
The FW thread listed the following terms and conditions:
"Promotion valid until October 15, 2012 and subject to change without notice. Checking account offer: Available to non members who open a Western Checking account at same time as establishing membership. $100 bonus will be deposited one business day after account opening. One checking bonus per member. Fees could reduce yield on accounts. Normal membership and checking criteria applies. Member will be responsible for all applicable taxes. Western employees, volunteers, and family members are not eligible. Western reserves the right to change the program rules at any time. Not valid with any other offer."
Western FCU is an all-access credit union that can be joined by anyone via the Surfrider Foundation. The promo page even says that they "will initiate your Surfrider Foundation membership and cover your initial membership fee."