i think you should consider the Konoha Great Tree Level 7, there may drop Madara Ten Tails Frags. and since it's max level of Konoha Great Tree, you may spend a lot of your coupons to get 180 frags of him.

but don't forget, in order to openthe level 7 Tree u need to offer 20.000 Cps. so, roughly to say, you can spend 120.000 + Cps on Konoha Great Tree for a 100% secure frags of Madara Ten Tails Jinchuriki.

ofcourse chance to drop arguably the strongest and one of the most expensive Ninja to get currently are pretty low. but, one of my friend who quite spender but not a whale pull 80 frags of Madara Ten Tail Jinchuriki Fragments out of Lv. 7 Konoha Great Tree with 120.000 Cps (in total). ofcourse, he use all the rebate for getting those coupons faster such Monthly and Platinum Monthly Card, Froggy, Etc. but this give us a rough vision how to get Madara Ten Tails Jinchuriki Fragments using Coupons only, which is amazing if you ask me.

oh yeah, i had to mention aswell, he got those 100 Frags of Madara Ten Tail Jinchuriki Jackpot from the Slot Machine in the other day, that's why he intend to pull that to it's highest potential.

hope this help you.