Hi irfankhairulazh
Scale pricing (as with most Jira plugins purchased through Atlassian marketplace) is based on your Jira tier.
Zephyr Enterprise a standalone test management solution which has a bi directional sync into Jira can be purchased based on number of testers as QA have of full cost of ownership.
For more information check out https://smartbear.com/test-management/zephyr-enterprise/free-trial/
If you have more questions for Scale, post them here asits a place dedicated to Scale users ( this community is Zephyr Enterprise hence why there was no response)
https://community.smartbear.com/t5/Zephyr-Scale/ct-p/zephyr-scale-community
Thanks
Vincent