Riddler Hobbies Goldcrest

This store is ok. Though a lot of it is dedicated to action figures and gashapon figures, they still carry some 1/18 and 1/43 models. Auto Art, IXO, Minichamps and Ebbro, but mostly Ebbro cars. The store is ok but a little cramped, like the toystores in Hong Kong.

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Toyzone Hong Kong

This store is located in Causeway Bay near the Toy R Us store there. A lot of collectible toys can be seen at this shop. Most items here, according to the staff who works there, are consignments from collectors. Most of the items here are rare and out of production. Some 1/43 diecast cars can also be found here, but tomicas abound this toy store.
Prices vary as an item can be really cheap and at the same time, some items are also very expensive. They have a lot of toys that they needed to open another shop across the hall to accomodate all the toys that they're selling.
The shop is literally cramped with toys and collectibles that I wouldn't really recommend this shop to a person who is claustrophobic (Actually its like entering a library hall but instead of books, the store is cramped with toys) Still, this store has something for everyone. This store is more for the toy collector than a diecast car lover.

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Nikko Singapore

Nikko is located in Singapore and has a lot of 1/43 and 1/18 diecasts. They carry mostly Minichamps, Auto Art, BBR, Tameo, Ebbro and Kyosho. No 1/64 cars here, only 1/43 and 1/18 scale cars. They have the monopoly on 1/43 and 1/18 diecast cars in Singapore. Their prices are a bit on the high side. Still, if you are a member, you get a cool 20% discount. If you spend more than US$200, and you are not a resident of Singapore, you can ask for a tax reimbursement form, which you can claim at the airport before you leave. Nikko has a good selection of diecast cars, but nothing out of the ordinary. Their layout is very nice and besides diecast cars, they also sell radio controlled cars.