Preparing for the LSAT usually comes down to 3 paths, each with their strengths and weaknesses.
The first, and cheapest option is self-study. Typically students can spend under $500 and gain about 10 points from their first diagnostic practice test with this method, given they are self-motivated use great resources.
The second option, which has a moderate cost, is taking a course. Usually students spend about $1,500 on these courses and get similar results to self-study; they gain about 10 points.
The final option, which is generally the most expensive, is private tutoring. Students typically spend $175/hr or more for a great tutor and reach total amounts of $2,500 - $5,000 to work with a private tutor. This route is certainly the most effective, with students seeing 20+ point increases from their first practice test.