Similar to Catalog Function but instead of regular price and sale price allow a starting/opening bid and bid increment and allow folks to bid on an item---without checkout---until admin accepts/declares top/winning bid. In our case, our only product is ad space but we have no idea what we could get for the most prime location (back cover) because we've always given the last person the right of first refusal and they renew each year. We think it should bring in more than what we are charging and would like to experiment with this in 2020 (without having to request mailed bids).