Toys R Us currently has the Captain America w/Motorcycle polybag available as a free gift with Lego Construction purchase of $30 or more. I finally pulled the trigger on the Lego Ideas Big Bang Theory set to qualify, they had the Disney Blind-bag Minifigures in stock and I was tempted to grab 10 of those and see if they would qualify but the lady working the customer service desk said they wouldn't.
Starting on Sunday, if your local TRU has any left over, apparently they are allowed to start selling the Cap polybag for $3.99.