The vast majority of vibrations are tire/wheel related. You need to determine if the vibration is at wheel speed, driveshaft speed or engine speed.

Driveshaft speed will be about three times as fast as wheel speed. If it's engine speed you can probably feel the vibration when you rev up the engine while the car is in a neutral gear.

If you're on a budget, you can simply swap wheels front to rear and see if the vibration changes. If so, then you know it is tire wheel.

Good luck,