There are several store in Horizon Plaza, most of the well known stores are on the pricey side but there are a couple of less expensive options.
For a convenience and affordability, it's worth checking out DSL Furniture. They have a good selection of home contemporary furniture at good prices.
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If you feel adventurous, you can always take a trip up to Shenzhen. There are several malls dedicated to furniture. I am not familiar with all the areas but along Zhanyi Rd next to Hongling North is a good area with several malls to check out.
You can always find some good deals on the asiaxpat classifieds section.
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Hope that helps