For the last shipping from Globaltoys I paid 13 $ - two articles combined, not asking for anything, this was the automatic discount.

This shipping rate is very cheap compared to many, many other countries.

If you want to order more articles in one shipment, follow the advice e.g. given by Bill Oreto bellow.

As a rule: to ask for a discount after having already ordered is too late, because all the data for tax, customs etc. is already generated.