Maybe get used? That way you don't support Google and it doesn't cost too much. Not sure how much mine cost, I got it as a gift from my mother who's pretty good about finding sales for things, although it was brand-new.

If not that then people seem to see CalyxOS as a decent alternative.

FYI, I just got LineageOS on a cheap Motorola phone ($140 USD, but you need a PC to do the install)

I got to expense mine, wouldn't pay that much if i had to actually pay lol