If it will cost more for shipping, then it won't be necessary.
It's not necessary to do so if the shipping fee becomes more expensive.
1) If it will cost more for shipping, then it won't be necessary.
輸送費が高くなるのならそうする必要はありません。
shipping = 輸送
shipping fee, shipping charge, shipping cost ＝輸送費
2) It's not necessary to do so if the shipping fee becomes more expensive.
It's not necessary to do so = そうする必要はない
become more expensive = もっと（値段が）高くなる
日本 
