The Arena and WZ boost packs are now available in the store for 4.99 US or 150,000 RP. You seem to get about 20 boosts per pack, so feel free to indulge if you're chasing 152.
Edit: Apparently these are gone on Sunday
https://twitter.com/Unyshek/status/1024770188896436224
Edit: Apparently these are gone on Sunday
https://twitter.com/Unyshek/status/1024770188896436224