Anytime you are using a microphone heavier than a standard hand-held dynamic (say, a Shure SM-57 or -58) there needs to be a boom with counterweight on the other end to help stabilize the stand and prevent the mic from toppling over.
There are a number of ways to accomplish this, and the price range for these boom stands is almost as wide as the price range for microphones themselves.
To find something in your budget that will do the job (once you have decided on a new mic, that is) just start searching any of the major music supplier outlets online for "boom microphone stand".