Tata neu Infinity CC - 10% direct off + 5% Neu coins if ordered from Tata Neu app + 5% coins from CC
Axis Select - Direct 20% off+ 5% Neu coins if ordered from Tata Neu app
+ if you buy in the beginning of month they have 200+ neucoins offer.
I guess these are best ways for saving. If you are specifically looking for vouchers for specific reasons, then its different story.