Shop Mod

Hi Guys

I have tried a few but not have the features or if they do I can’t find them lol

What i’m after is a shop plugin that allows

Physical Items
Digital Items
Postage based on how many items…for example

1 book is 5.99 postage for 1 book is say 1.50
if they add a second item it them adds say 0.75 for postage

so

book 1 5.99 + 1.50
book 2 5.99 + 0.75

and so on, so for 1 item postage is 1.50 but for every other added it adds 0.75.

Thanks in advance