I don't know why or when this changed, or for how long, but the 2x $20 Wise Cleaner set, Disk Cleaner Pro 6 and Registry Cleaner Pro 6, is now free of charge, if you give them a/your name and email address. Their Wise PC Engineer is still $40.
http://www.wisecleaner.com/giveaway.htmlI believe this set is well respected.

Edited:
Both Wise Registry Cleaner are Wise Disk Cleaner designed to be used in tandem, allowing users to streamline their Windows Registry and optimize their hard drive, and we recommend to run Wise Disk Cleaner before run Wise Registry Cleaner.