I want to buy fencing device

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I am planning to install and configure Red Hat HA for my application. For this I have to buy a fencing device and its power switch.

1- Possible to buy it from Internet and deliver it to Pakistan. Any authentic website ?
2- What is the expected price of Fencing device and its power switch ?
3- Is it must to buy this physical device (i.e., fencing device) or can we go with other solution which can be software base ?

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