iTop frequently runs seasonal discounts (up to 70% off). They also bundle PDF Pro with other utilities like iTop Screen Recorder.
For more detailed insights on its performance and pros/cons, you can read the review on Medium by Sadique Mannan . itop pdf pro key portable
iTop PDF is available in both a free version and a "Pro" (VIP) version that requires a license key. iTop frequently runs seasonal discounts (up to 70% off)