Buying expensive champs as beginner?

I can't deny it anymore: I fell in love with Zac from this week's free rotation. The amount of butts I handed to people in the last few days is astronomical. However, I'm really new (Level 11 as of now). So far I only bought a single 450 IP champ, but Zac costs a whooping 6300 IP. I haven't even gathered that amount of IP over my entire career yet, and I don't want to dump it all on a single champ once I reach that amount. On the other hand, I've made a solemn vow to never spend real money on this game if I can help it. So, do I have any alternatives?
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