Finally there is a McArthur Glen nearby. I use the one near Edinburgh whenever I'm in Scotland and there is is pretty good. You can usually find some good bargains.
I've not been to the Salzburg one yet so I can't vouch for it but certainly intend giving it a go before too long.
From the south of Munich it should be less than an hour and a half to drive there. On a very good day...
McArthur Glen at Salzburg Airport



