No tax on books

For shipping rate, check on amazon's page at the bottom

If want exact shipping amount, login to your account, add to cart, and select address, it will show you a shipping amount

I usually choose courier, it will take 2 days fastest, but price is more expensive than the books you buy. Better to buy many in one shot. Also note that if you buy big items (like boxset books), there is a surcharge of USD10.

Else, If you have relatives or friends in SG, the best and cheapest way is to ship to SG, using their free shipping option. Minimum spend 125USD.

No problem.

Note, not all items have free shipping to SG as there are restrictions applied (e.g. must be sold by amazon.com). If one item in your cart does not meet the criteria for free shipping to SG, it will affect your whole cart and you will not see the free shipping option. Search "amazonglobal eligible free shipping singapore" on google. It will bring you to a special amazon page that only lists goods that are eligible.

This free shipping option may be removed at any time. Reason is because when I first did this purchase, there was free shipping to India. A few months later, India was no longer listed.

Lastly, happy shopping