Solo's flea market is just a short distance from the Mangkunegaran Palace. The market was once a dusty collection of stalls selling old collectibles, but it got a big upgrade a few years ago and is now a clean and very presentable place, looking more like a tourist trap than a traditional market. It sells antiques and all sorts of other junk, in addition to car parts! One of the things you might want to look out for are the batik stamps. They're made of brass or copper and old ones will be black with crusted ink except on the face of the stamp.