Are there savings or promotions handy for bulk purchases of Wuthering Waves Lunite on Manabuy?

https://www.scribd.com/document/987792285/Wuwa-Top-Up-vs-In-App-Purchase-A-Complete-Lunite-Pricing-Guide-177725

Are there mark downs or promotions feasible for bulk purchases of Wuthering Waves Lunite on Manabuy?