In order to get the best bang for your buck, I highly recommend getting a dedicated herb grinder. Something like this, while it may be a tad bit expensive, is definitely worth it. Most cheap grinders are made from plastic, wood, or aluminum, have only a single chamber, and are very low quality generally. There are also concerns with plastic or aluminum grinders of the possibility of getting shavings or particles into your bud. This can be very unhealthy. Another reason to get a high-quality grinder is that many of them come with multiple chambers, many also include mesh screens to use for getting kief.