One thing you might try is taking notes on what Adsense shows (and what shows on competitor sites). You might find a product that is a good fit that way - you m

One thing you might try is taking notes on what Adsense shows (and what shows on competitor sites). You might find a product that is a good fit that way - you might also look through the search keywords in google analytics and see if any are purchase based. You might be able to add Amazon affiliate links as well.