Sure, here's a URL for each of the previously-listed online marketplaces:

 - Carousell: https://id.carousell.com/
 - Craigslist: https://www.craigslist.org/
 - eBay: https://www.ebay.com/
 - Facebook Marketplace: https://www.facebook.com/marketplace
 - Gumtree: https://www.gumtree.com
 - Kijiji: https://www.kijiji.ca
 - Leboncoin: https://www.leboncoin.fr
 - Letgo: https://offerup.com/
 - Markt.de: https://www.markt.de/
 - Mercari: https://jp.mercari.com/
 - OfferUp: https://offerup.com/
 - Preloved: https://www.preloved.co.uk/
 - Quoka: https://www.quoka.de/
 - Rakuten: https://fr.shopping.rakuten.com/
 - Shpock: https://www.shpock.com/en-gb
 - Trading Post: https://www.tradingpost.com.au/
 - VarageSale: https://www.varagesale.com/
 - Vinted: https://www.vinted.com/
 - Yahoo Auctions: https://auctions.yahoo.co.jp/

For easy reference, I have removed duplicate mentions and sorted the list alphabetically. Sites that do businesses in multiple countries often have a URL for each country, so let me know if you'd like a specific country/company combination.
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