Everyone knows the phenomenon of trying to hold your breath underwater - how at first it's alright and you can handle it, and then as it gets closer and closer to the time when you must breathe, how urgent the need becomes, the lust and the hunger to breathe. And then the panic sets in when you begin to think that you won't be able to breathe - and finally, when you take in air and the anxiety subsides...that's what it's like to be a vampire and need blood.
Francis Ford Coppola - BS Dracula: The Film and the Legend
Yes, people charge still. I believe I have seen it going from 5k-20k a bite. There are also a lot of people getting scammed, so if you buy one, don't pay first.
There are people that give them away for free. One of my guilds, gives away 2 bites a week.
On PC, no one really charges for a bite as there are so many players who are werewolfs, most know someone who has a spare bite and willing to give it away.
Vampires are more rare (cause not many people want to be one end game) so they are a little harder to get, but asking in guild normally gets one.
On the console.... yes, they charge alot and normally just take your money and run.