Calculating shipping charges is always very difficult. At the present time there are no good ways of accurately predicting shipping charges on this platform. I do not charge “handling”, and I do not want to mark up shipping. I try charge you just what I spend. All of my shipping charges are “flat rate” based on my experience.
My preferred method of shipping is USPS Priority Mail. This service provides traceability (in the US) and reasonably rapid delivery. I do offer a First Class mail option, but since First Class is not traceable, the buyer must take full responsibility for loss.