You can get the 32mm breast shield online from either Pupsik Studio or Qoo10. If you urgently need them, I believe Kiddy Palace has them. You can also try the brand Maymom, they have more sizes available that’s compatible with Spectra pump.
I get them on shopee! https://shopee.sg/product/242594539/7732031072?smtt=0.0.9
Kiddy palace but shopee is cheaper
Try Robinsons
Eileen Cheong