Are there discount rates or promotions readily available for bulk purchases of Wuthering Waves Lunite on Manabuy?

https://www.scribd.com/document/987516701/Wuthering-Waves-Lunite-Pricing-Is-Top-Up-Cheaper-Than-In-Game-148519

Are there discounts or promotions a possibility for bulk purchases of Wuthering Waves Lunite on Manabuy?