Activated Charcoal Home via Amazon offers the Diamond-Shaped Silicone Ice Cube Trays 4-Pack for $17.98. Coupon code "XWWDFF9W" cuts the price to $8.99. With free shipping via Prime, that's $16 off list and the lowest price we could find. The trays are made from silicone and are flexible and BPA-free. A funnel is also included. Deal ends December 31.