Originally Posted by sktanmoy
Now my question is'are they reliable?'.
I have heard of http://www.internetbs.net/
(seems to be the least expensive of all) many times before, in spite of direct experience, I don't have a reason to believe they are unreliable.
The way you ask begs a question if even the largest domain registrars are reliable. We've heard stories even of large companies going under.