To find the median winning bid, we need to first arrange the bids in order from lowest to highest:
$2.00 $2.00 $3.00 $3.00 $3.00 $5.00 $6.00
There are seven bids in total, which means that the median is the fourth value when the bids are arranged in order. In this case, the fourth value is $3.00.
Therefore, the median winning bid is $3.00.