At the Darkness release event they partner up with a local liquor store and charge $18 / bottle. After that, I've seen it anywhere from $18 - $30 in the store. So, $25 / bottle doesn't seem that out of line.
It's fantastic. I'm actually doing my best to come up with an extract clone recipe. Attempt #1 will be coming up shortly and I'll just keep adjusting from there. It won't be perfect but maybe it will tide me over until Darkness is released again the next year.
Darkness retails for around $18-23 when it first comes out, if you can get it. after that the price goes up. 2 and 3 year old bottles can fetch $75+. one of my co-workers bought about a dozen bottles so he could trade for other rare/collectible beers. Smoke was $13/bottle at my local store when it came out last week. im not a big smoked beer fan though and "Smoke" is VERY smokey.