Amazon has CPR V5000 Call Blocker [amazon.com]
that blocks all unwanted, scam, political, nuisance Robocalls at the touch of a button, Prime day only for $68.99. USA's #1 home phone call blocker.
More call blocking options:
5000 Scam Numbers Pre-Programmed Plus the Ability To Block A Further 1500 Numbers or Area Codes At The Touch Of A Button
Block a number by entering #2 on any DECT handset connected to the telephone base.