Probably not online. But I almost bought a Lenovo Laptop that was open box from $1200 down to $900. Always lowball and see if they accept. And they accepted but I waited for my iPad Pro.
Also helps to negotiate you can always say you’ll add on a warranty.
In store you can definitely haggles on open box or refurbished items. Especially now after the holidays each Best Buy has at least 2 iPad Pros newest generation at a huge savings.