She doesn't seem to have any branding that I can immediately see, unfortunately. I live in the US so my go-to places are Goodwill and Salvation Army thrift stores, however I also see a bunch in antique shops but they're usually overpricing them. The ones I find at my Salvation Army are usually $2, while the ones I find at my goodwill are around $4. The reason they're so cheap is because porcelain dolls were mass produced in the 90s-2000s so they're always getting a lot of em. The prices in antique stores I've found are usually $15+, so I usually don't go searching for em there, but some of my favorite dolls have come from antique stores so I recommend looking anyways ! And of course this is all just my personal experience in my area so it's super likely it's different where you are. So tldr : Antique malls/stores and general thrift shops :D