Yes, I've seen some at craft stores and scrapbooking shops, but the problem you'll have with those is that:
1. They are replicas, thin plastic usually, and the quality may not be what you want bang on every day for typing
2. they're really only for decoration or for spelling out words in scrapbooking, so you'll run into the problem of not having a key for 'enter', 'ctrl', 'alt', and the like.
I'm a props master for plays and I run across many old typewriters that are rubbish now. Yes, they were once great, functional, and it probably would kill you to tear it up at one time in it's life, but now they are so broken it's just not practical to repair. They only thing they're good for now is sitting 30 feet from an audience while looking new and useable, or for taking apart and reusing parts for other things.
Obviously, I'm not saying buy a working on and scrap it, but with some searching and asking around, I'm sure you could find a broken one (probably for cheap too, people may be happy to get rid of a broken one). Or, for the ultimate personal touch to your laptop, like Frolicking Johnson, you could make your own with whatever font you'd like. Good luck though in whatever direction you take.