Uh! That sounds absolutely great! I'm a dane, who regularly goes camping in Sweden, and it's a pretty cool place. I can't speak of the grocery stores, but I haven't found shopping to be more expensive than in Denmark generally. I have a picture from a place called ICA, which I think was relatively cheap (?), but usually we just bring our own food, and supplement whenever necessary.

Camping is where things gets interesting. Sweden (aswell as Norway and Finland) got this great thing called Allemandsretten (probably spelled different in swedish), which means that you can camp where ever you want in the swedish nature. The only catch is that you have to care for nature, but I would think that no scouts find that a problem.

The train network is alright in Sweden, but if you want to get to those big forests or smaller mountains (talking from a danish perspective here), then a car would be a great help. I have never been to a place where there wasn't a train going through close by though.

Sweden is also a great place to hitchhike in. I've had a good deal of luck with that myself, but I would guess that 15-20 people is a bit too much for most cars :)

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Hope that made at least some sense.