A quick search in the Atlassian Marketplace will show what you need:
Overview
https://marketplace.atlassian.com/plugins/lv.ebit.jira.plugins.sladiator/server/overview
Pricing
https://marketplace.atlassian.com/plugins/lv.ebit.jira.plugins.sladiator/server/pricing
The plugin is free. SLAdiator is a cloud based service, you pay by number of tickets: https://sladiator.com/pricing
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