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?
I asked for the Lord of the rings trilogy for my birthday in high school, if that counts. Then it was the chronicles of Narnia, followed by the Chronicles of Thomas covenant, the unbeliever (one by one as they were published).