Getting an old enough edition of Apostol's "Calculus" to not include linear algebra might be a bit challenging. Linear algebra was added to both volumes in their second editions, which came out in 1967 for volume 1 and 1969 for volume 2.

The second editions are still the current edition, so no worry that you might be missing out on something if you go with used copies. If you do want new copies (maybe you can't find used copies or they are in bad shape) take a look at international editions.

A new copy of the international edition for India from a seller in India on AbeBooks is around $15 per volume plus around $19 shipping to the US. Same contents as the US edition but paperback instead of hardback, smaller pages, and rougher paper. (International editions also often replace color with grayscale but that's not relevant in this case because Apostol does not use color)).

You can also find US sellers on AbeBooks that has imported an international edition. That will be around $34 but usually with free shipping.

Indian editions sometimes have different question sets to prevent students from using them in other countries' coursework.

They also have a hologram sticker alongside a printed warning that they are not for sale or export outside of India, Nepal and a couple of other countries.

I think those restrictions apply only to retail sellers in those countries, not to purchasers or used stores.

I know where my confusion comes from.

I studied from a first edition of volume one before there was a volume two, so it wasn't marked as Vol I.

Friend dug it up from his old books, since I seemed to be quick learner.

Thanks for the info on cheaper editions, not important to me but to others in USA it might be a big help.

i bought a compilers book that was an Indian edition. The paper and print quality was so bad (like smudgy) that I could not read it and I didn’t think I was particularly picky about this. Not sure if I just got unlucky or if this is generally true?

Spivak's book is still good too.