On Slickdeals, they moved the Kohls thread to the Consumer Awareness forum.
In addition to the 30% off code, Kohls cash earning is now AND they emailed me a single use coupon for $15 off of a $50 after discount purchase 3 days ago. The "round up" for Kohls cash earned from their credit card, came last week. Check your emails for the last 7 days in order to stack discounts.
Free shipping codes are non-existant, unless you have spent over $75 in an order, or over $600 on their credit card.
Cash Back on Ibotta, Swagbucks, Mypoints does come through, but check the terms regarding eligible codes.
hth