Basically, you need to get links to items on
Amazon. Even when they're out of stock, add them to a list. The wipes and sanitizer don't usually show up in searches unless they're available or at least it can be hard to find them if you're looking for specific brands. I used various blogs, slickdeals, etc to get links to products. Over time you should cultivate a nice list of various items. Throughout the day refresh your list, you can quickly scan and you'll see the Buy Button when an item is in stock. Immediately add to cart and check out. Pause only long enough to make sure the price isn't too inflated. Add and check out. You can do this for Walmart as well, but I've had the best luck with Amazon. Being Prime I didn't have to worry about shipping whereas with Walmart I either paid or needed to keep items in cart and ready.
I have a personal blog where I've shared this strategy and I have a list of items there. A few of my friends have used this method and have been successful.