Bearings are what makes the wheels spin, and generally speaking you get what you pay for in terms of speed and durability. The majority of skaters land in the $18-25 range, but the lower priced options get the job done. Higher end bearings like Bones Swiss will last for years and can be brought back from the dead with minor maintenance and care. They may be out of some price ranges, but they are considerably faster and more durable than mid-range bearings.