Hi @harshentrepren
Your question is a bit misplaced.
This forum is about the mobile OS Ubuntu Touch.
You can find the list of supported devices here at : https://devices.ubuntu-touch.io
As for the price it will depend on your country and what you have access to as some people pointed out in this forum.
BTW I moved your post to "Off Topic" as it is about "different OS" and not specifically Ubuntu-Touch.