I always offer combined shipping !!!
on DESKTOP version of eBay put all Items you want to buy to Shopping Cart ( Not Pay directly! )
and REQUEST A TOTAL invoice from us with Combined Shipping .

NB!! eBay mobile version not allow to Buyer use Shopping Cart and REQUEST A TOTAL  from seller (Combined Shipping) - only DESKTOP version of eBay allow do that.
 Mobile version  of eBay only ask direct payment without Combined Shipping discount . 


Postage fee worldwide 
0-250 gr. - 15 USD
250-500gr.- 23 USD
0.5 kg.-1 kg. -28 USD 
1-2 kg -35 USD
2-5 kg - 45 USD.
So , best way -buy 4.9 kilo )