There is no textbook for 1PA0.
1E03, she's changing the textbook, and that's definitely worth buying - that was the only book I read cover to cover, and you likely would not have done that well if you didn't.
Maths, I personally thought the textbook was useful, but that's personal preference.
Econs, you definitely don't need micro, but I found macro to be helpful, though you can just use the online textbook that comes with Aplia, which is the online optional component of the course, though the majority of students opt in to the program.
You likely are also in computer science 1BA3, assuming you are in commerce, which you definitely need the textbook for as there's a lot of details to learn.
If you're interested, I have math and computer science to sell still. Let me know closer to school if you're interested