The cost of Performer 8 varies based on the quantity purchased. For a single month's supply, it costs $64.99. There's an option to buy 2 months' supply for $129.99 and get 1 month free, which breaks down to $43.33 per month. Additionally, purchasing a 3 months' supply for $194.99 comes with 2 months free, making the cost per month $32.50.