Multiple shipping options

Currently all the items in our shop ship Priority Mail Flat Rate (as these all need the $100 insurance included) .  We want to add some inexpensive items.  Is there a way to allow most of the items in my shop ship Priority Mail Flat Rate but enable us to add inexpensive items and ship it at a  less expensive rate being assigned to that item only? Not a drop down at the end where the customer chooses. Thank you.

That’s really unfortunate. Thank you for your reply.