You could try Clementi Florist & Aquarium, Biotope, Ecoculture or Midori. You can place an order with them, and they will bring the plants you want in for collection. You can get their contact numbers/addresses from the LFS directory.
As for yamato shrimps, the shops mentioned above should carry them, as do most LFS actually. Give them a call to check on availability before going down.
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