An alternative idea is you could create a new page with info on why your current products are better for the intended purpose of the old products. For example...flyers are generally viewed as a waste of materials by Millennials and many others, so instead of producing flyers you now focus on banners (or business cards or whatever you think is a better alternative). So you could redirect your old page about flyers to a new article on the benefits of another product over flyers.
This probably would only work well for some products, certainly others will be a redirect to an already existing page.
