Product Listing Ads from Google and Bing are a low-cost, effective way to get targeted traffic to your products. In fact, many Protocol Three clients see the best ROI and conversions through Product Listing Ad campaigns. Product Listing Ads (or PLAs) are produced by... Not everyone who sells online wants to sell retail. For instance, if you are a wholesaler or a distributor and your customers are businesses, you may have a wholesale price, or many wholesale price levels, that you want your audience to see but you do not want to... 