Three things about this stout that lead me to a “at cost” value:
1) It’s not that highly rated on any platform with multiple ratings (Untappd, RateBeer, BeerExchange). I know you shouldn’t let other people taste for you but it is another data point.
2) is a 2-3 year old raspberry stout (and outside of BCS fruit variant stouts haven’t seemed to stand up to time very well)
3) Never seen an ISO.
The value maybe a little bit higher if someone is a Mikkeller enthusiast, but other than that I would put at cost.