turn signal replacement

Hey all, I just picked up my bike and already broke my front left turn signal cover. It's my first bike. Where can I get a replacement? Thanks.

Hello, Made the mistake of parking on a packed gravel/dirt surface, and when I came down from the hike, she was down on her side. All things considered, it didn't cause much damage, but I will be needing a new front left turn signal. Can anyone recommend a good website for this? I'm open to...