Hello student you can purchase books from ICAI website, refer to the link mentioned below - https://icai-cds.org/

You need not to pay separate fees for books as it's included in the fees of registration you just need to use your voucher and place the order on ICAI cds portal.

Incase if you're willing to pursue reference books apart from ICAI books you can purchase books of various teachers/authors as mentioned below

1. Swapnil Patni
2. Ankita patni
3. Pravin Jindal
4. Anand Bhangariya
5. VSI classes Jaipur

Feel free to comment if you've any doubt

Good luck

Hello,

The best source of getting books for CA foundation from online which is cheaper, more knowledgeable and advanced in comparable to hardcopy.

For getting the best e-books  online go through the link given below:-

https://finance.careers360.com/articles/best-books-for-ca-foundation