Postal costs are not up for negotiations.
I combine shipping per official request that you make from your cart from the browser (app doesn't have this option). I don't do it any other way.
If it's says "sold as is" it is sold as is, read descriptions, look at the photos, ask questions, there are no return unless I sent you a wrong thing, or damage wasn't described of shown on photographs.
For the frivolous returns on the items where I allow returns you pay a minimum of $36 restocking fee (or 10% of the price, whichever is greater).
Thank you for your kind understanding