送料がお手頃ならば買いたい

I think i will buy it if the shipping is reasonable. I am aware that it's gonna be a bit more than the usual since its heavy.

送料がお手頃ならば買おうと思ってる。通常より重いだろうから、少し高くなるのはわかってます。

if the shipping is reasonable：送料がお手頃なら

it's gonna be：It's going to be ～になるだろう