I just completed level 95 on Item Hunt... The 90-95 quests cost me around 140million sp. I have around 100million sp left. How much should I build back up to before trying to complete the final 5?

I waited to do mine until the Black Friday sale in November. With the likeliehood it would ask for something in the Cash Shop, there was a high chance it would either be in stock and/or 50% off. It saved me a lot of sP and only cost me about 110mil for levels 90-100.

That's a great idea, thank you :)