A few years ago, I spent most of my savings on The Lunar Chronicles by Marissa Meyer (Cinder, Scarlet, Cress, Winter, and Stars Above; I didn’t get Fairest), read them all, and loved them…though I didn’t reread them and sold them some time later.
And what was the first series you spent most of your savings on?
The first series I ended up owning in its entirety was Anne of Green Gables - my mom had an incomplete set but I loved the books so much she bought me the two other books missing from the set.
The first series I bought for myself was Harry Potter, followed closely by Percy Jackson. Both of those are what I spent most of my savings on.