Here are some San Diego Comic Con 11 swags promoting Mass Effect 3
Bioware gave some codes away to San Diego Comic Con 11 attendees. A seller is selling 5 of them on ebay right now for $18 each. There’s was one that sold for $102 a few weeks ago (maybe cause it included other SDCC swags?).
Similar codes like these for avatars or characters normally goes for around $20-$50 depending on how popular they are.
Other swags from SDCC 11:
Hotwheels Legendary Van Toy – This was given at the panel where Guillermo Del Toro spoke about his new movie called Pacific Rim.