Hi! Honestly, the 9oz Avent bottles are a bit harder to find now kaya a few of us moms have been going with the 8oz or 11oz instead, either Lazada or Shopee usually have the Avent range, pero you might need to check different sellers para ma-compare ang prices. Try searching "Philips Avent bottle" directly, or kung sa physical store ka mas prefer, Watsons and drugstores usually stock them. Good luck finding the size you're looking for!