There are two ways to sell used items in Singapore; one could either sell to traders or people online.
To sell items to traders, one could use the site cashconverters.sg. More details on the same can be read here
To sell items to people online, there are numerous options these days; this includes
Craigslist
Using Craigslist is easy and is popular in Singapore; one has to upload the product pictures along with the price and description to initiate a sale. With the free two-way confidential e-mail system, the details of both parties stay secret unless revealed by both parties.
Website: https://singapore.craigslist.org/
Contact/ help: https://www.craigslist.org/about/help/
Gumtree
The Gumtree website is an advanced version of Craigslist and essentially offers the same services; the reason for the Gumtree site’s popularity these days is due to its clean interface and easy navigation.
Website: https://www.gumtree.sg/
Contact / Help: https://help.gumtree.sg/SG/?cu=1&fs=ContactUs&l=en_US
Expat Living
Expat Living’s noticeboard is a free site where people can find pre-loved furniture and goods at a bargain price. Similarly, there is another site named “Junk to clear” with almost the same functionalities and the only difference is that the “Junk to clear” company will come and pick up the items from home. The latter is becoming famous among quick junk cleaning service seekers.
Website: https://expatliving.sg/notices/
Contact / Help: https://expatliving.sg/contact-us/
Address: 36 Carpenter Street, #02-01 The Hive, Singapore 059915
Phone: +65 9112 0652
Email: info@expatliving.sg (General enquiries), sales@expatliving.sg (Advertising / Sales), subscription@expatliving.sg (Subscription), production@expatliving.sg (Production), editorial@expatliving.sg (Editorial & Media Releases), calendar@expatliving.sg (Calendar of Events), events@expatliving.sg (Events)
Expat Living Hong Kong info@expatliving.hk | sales@expatliving.hk | subscription@expatliving.hk
Decluttr
Decluttr is a good choice among those who would like to receive the product without meeting the seller. The functionality is simple; one has to enter their product’s code on the app where the appropriate price will be displayed and based on the orders, Decluttr will pick and drop it in the concerned location. On successful delivery of the product, the seller will be credited with the amount. The app is available for both Android and iOS systems. However, the app limits the listing to certain products only such as CDs, DVDs, games, books, Legos, cell phones, and other tech devices.
Website: https://junktoclear.com.sg/
Phone: 67492306, 6749 9510, 6749 9520 (Whatsapp Call / Whatsapp Message)
Business hours: Monday to Friday: 8.30am – 6.00pm and Saturday to Sunday: 9.00am – 2.00pm
Email: junk@skaplogistics.com, adam@skaplogistics.com (Customer feedback)
Amazon Trade-in
Amazon Trade-in is a simple concept where people can trade textbooks, kindle e-readers, cell phones, tablets, Bluetooth speakers as well as video games in exchange for Amazon Gift Card(s).
Website: https://www.amazon.sg
To conclude, there are several portals with dedicated purpose(s); it is advised to check into the purpose(s) before choosing the same.