Scores of Palm Beach County homes were sold to investors at foreclosure auction this month for as little as $200 following the collapse of the David J. Stern law firm and the ensuing confusion while thousands of its cases are reassigned. It’s yet another muddle for the overwhelmed foreclosure courts to sort out as former Stern cases went to auction with no bank representation, bids or proper public notice. The result on Wednesday: 56 percent of winning offers were from investors or individual buyers who in some cases spent no more than a month’s mortgage payment to get homes that sold for upwards of $240,000 during the real estate boom.