Air India has been operating a new lounge at the Delhi Airport Terminal 3 since a few months now. While I haven’t been inside this lounge, I’ve walked by on my way to the other lounges at the Domestic wing of this terminal.
It is an expansive lounge, with the looks of buffet meals, big couches and is generally empty, because most of the traffic is directed to the Plaza Premium Lounge by the credit card companies, Jet Airways and Priority Pass.
However, Air India offers paid lounge access to this lounge for a small sum of INR 500 ($8) only per visit (valid for two hours), and you can also ask for a shower for another INR 200 to be paid.
I’m very sure this lounge will start getting full after the Star Alliance entry, but for the moment, this is the cheapest paid lounge at Delhi Airport T3 if you’re flying from there.