General

Not worth much atm but people pay 50-200 dollars for some 4-5 letter ones in the black market. Crazyyyy.

doesn't matter you will still get banned for making a dumb topic like this one

I am just asking price, not selling
It's like asking what's the NX ratio

Are they still expensive or not?

You're looking at... a temporary ban for selling them.
Don't do it right now, it simply isn't worth the risk.

You aren't allowed to sell IGNs, that against the rules. It's only value is how much you want it to be.