How much does this cost to the nearest dollar?

Sentry Call Blocker 3.1, Most Effective Spoof Call Blocker, Blocks 100% ROBOCALLS, Scammers, Election Calls, Telemarketers, Solicitors.
Unique ACTIVE screening, blocks all unknown or known spam calls. Fully automatic blocking after set up. Set up Whitelist (friends and family) with keypad. (New feature) REQUIRES Caller ID service. No need to take a bad call and then block it. No more bad calls, period. 100% effective on all robo calls, election calls, telemarketing or any solicitor calls. NOT COMPATIBLE WITH OOMA, CONSUMER CELLULAR OR ANY PHONE SERVICE VIA CELLULAR NETWORK. Dimensions 6.75 x 5.12 x 2.

Price is $79.00

Price: $79