Welcome to A-Man's Bricks.
We primarily sell discontinued sets and part outs from discontinued sets. If you're looking to purchase a discontinued set please make a quote request so I can give you accurate shipping information. Otherwise an order creates a binding agreement by you to buy the item, and that includes paying whatever shipping cost my providers offer me. Assume that for the largest sets packing + shipping costs in the US can be up to $100 and closer to $20 for the smaller sets.
Pieces orders are shipped in bubble mailers and each part is individulaly bagged for a clear unboxing experience on your end.
I am an AFOL selling my excess LEGO, please let me know if you have any questions.