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Make a list of everything at the end.
Then buy in as few lots as possible
You can create wish lists on there as well and one of it's biggest advantages is it gives you the shipping costs as you order.
Also, depending on how far down the burrow you want to go, if you want to keep track of it all, you could sign up to Rebrickable.
This site is linked to Brickset, so it keeps track of your sets, but , and i'm sure someone will correct me if i am wrong, I also think it can be linked to Bricklink and Brickowl so you can do a wanted parts list on there, then you can upload it to both. (Haven't done it myself so not entirely sure).