There are 3 shops but you need to know the place well. Pulau Gedong got one new shop selling aros. Never visit but just pass by. Another place call Pokok Mangga got a fish shop selling fishes just like our LFS. There's one close to the beach call Pantai Emas, the shop is located next to a Police Station. This one is interesting cos it sells lizards, snakes, tarantulas, mice, cats. I would say a all in one pet shop. I don't think is much help from description but ask around should get you there.
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