Hi there, really useful guide, thank alot

i have a little question regarding buying online.

is there a limit to the number of books in a box? if i want to buy 10 to 12 books is it alright to count the shipping cost as USD 4.99 + (10x4.99) = roughly 55 USD for shipping? Is there any other charges involve other then the price of the book and the shipping cost?

Thanks in advance