I would look at Amazon for third party accessories. Replacement bags, filters, side brushes are cheaper than buying from ECOVACS

PIGUOAT Accessory Kit Replacement for Ecovacs DEEBOT OZMO T8 AIVI T8 Max T8 Robot Vacuum Cleaner https://www.amazon.com/dp/B08JPFTG66/ref=cm_sw_r_cp_api_glc_fabc_fSxZFb0491D3W?_encoding=UTF8&psc=1