If you haven't heard of a BST group yet, get on board! These are fantastic social media groups where members can list and purchase kid/baby/adult clothing, home goods and more! They even have wedding-specific BSTs. Typically, because they are limited to member approvals and a certain geography, they're much safer than Craigslist. Just check out some of the items I've scored recently!
Slider door $20 - going to repaint and use for weddings! Pie safe (refinished project see here) $100
Kate Spade purse $45 Banana Republic Wellies $25
(ended up selling on eBay for $65 bc I didn't like color)