Are there any good examples of marketplaces that grew by focusing on the supply side first?

Yes there is!...A marketplace is a platform where vendors can come together to sell their products or services to a curated customer base. ... Examples for marketplaces Which grew as a result of focusing at the supplies end are large companies with huge inventories like Amazon, Rakuten or eBay or niche platforms like Etsy (handmade crafts), Runnics (sportswear for running) or Shop. All these Marketplace companies also had a better experiences by Focusing at the suppliers side or angle to better it's development Path.

If you wish to inflate supply side without user-activity, there are several good examples for that. It is however interesting to know that "supply side" is not only the one factor that influences the market place.
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There are many examples of marketplaces that grew by focusing on the supply side first. These include Amazon, Alibaba, eBay, Uber, Airbnb, and Foodspotting.

Marketplaces that focused on the supply side first include Amazon, Alibaba, and eBay. Amazon started by selling books while Alibaba has succeeded in China by selling goods. eBay launched with a focus on classified ads while the majority of its business is now in online auctions.

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Question - how do you attract and retain demand if you don't have supply ;). Lenny R has an incredibly thorough series of articles on the topic of marketplaces - https://www.lennysnewsletter.com/p/how-to-kickstart-and-scale-a-marketplace.