Your husband should be very happy to have such a good wife like you. Shanghai is a commercial city with people coming and going. When you go to Shanghai on a business trip, the gifts you bring back should be something that does not take up space, because this will make your journey easier. The following are my suggestions, I hope they will help you.
1: You can go to the famous Nanjing Road Pedestrian Street in Shanghai. It is the hottest place for shopping in Shanghai. There are also many discounted items there. You can go there and see if your husband needs it if you see any discounted items. If he does, buy it for him.
2: No matter how prosperous and lively Nanjing Road in Shanghai becomes, it still has the atmosphere of old Shanghai. Sanyang's cloud cakes and ham meat can always remind people of the old taste of Shanghai's streets in the modern world of decadence. So, you might as well bring some Shanghai specialties, such as pear paste candy, peanut crisps, ham, duck heads, these bits and pieces of food, although the price is ordinary, they are indeed not available elsewhere.