I combine shipping on multiple items shipped together for those that like to save on shipping costs.  I almost always get insurance since you can't trust a package to get anywhere safely so, should any damage take place, take pictures of the box with label, packaging, and item received to quickly get a claim completed and refund sent.  Regardless of what the IRS says, I'm a guy selling things for me and my family and not a business so please keep that in mind.  Being a jerk never gets you anywhere good anyway.  If you have any questions feel free to message me.  Thanks for checking out my stuff!