The McMaster site doesn't show shipping costs, because they package your items and then get the dimensions and weight. They only ship things very fast, and they charge you what that costs. They are optimizing for fast and correct, not cheap.
If you're concerned, you can call or e-mail them to ask for an estimate. It's worth noting that free shipping is never free -- it's either hidden in the item cost, or some corner is being cut.
If you're concerned, you can call or e-mail them to ask for an estimate. It's worth noting that free shipping is never free -- it's either hidden in the item cost, or some corner is being cut.