Been using two 2-1/4" computer fans salvaged from old computers - they're $5-6 new. Wired both to an old AC/DC adaptor, and plugged into a simple household timer. Cooler stands on end with drain plug on the bottom and opens like a cabinet. Fan on the bottom faces left, fan on top faces right - creates a great airflow. Used double-face tape to affix fans to back of cooler, and ran wires through the drain hole.
Total cost = $0.00 - all items where lying around the house.
cacman wrote: