Hi,
The roller weights are always sold as a "6pack", so one (1) pack - 6 weights. = $38.99
Make sure you get also the three (3) new separator sliders with it (don't know what they are actually called); sometimes they sell them separately for about $8.00
No new pulleys required. KNOWLEDGE required.
What slider weights are you putting in, and for what purpose? The actual weights are important to achieve what you desire, if chosen wrong you wasted time and money. I did quite some testing and ended up with 18 grams Dr. Pulley for best acceleration and top speed, But again, it depends what you are looking for.
PS: Are you SURE you can tackle this job properly? It requires an impact wrench and a bit knowledge. FYI: If you mess up and you damage the thread of the crank which is crucial to hold the front pulley on, it will be a major engine repair...