There are a few microphones which work directly with a USB connector. One in your price range is the MXL USB.006 which is about $100 or so. Much, much better is the SE Electronics USB2200A which is just over twice the price. I haven't used either of them but SE Electronics has a good reputation for value for money microphones.
These are the two main microphones which, I've heard, sound good when recording voices.
MXL - MXL USB Mics
SE Electronics - Welcome to sE Electronics
There are others made by Rode and Samson which are more expensive than the MKL but not as good as the SE Electronics.