I'm also looking for Trollhaugen. Any response from Andy Farmer/Northeast Vine Supply?
In addition to Bert Dunn a google search showed the northern New York based Seaway Cold Hardy Grapes (http://www.seawaycoldhardygrapes.com/) possibly having it. (Listed by http://ctgrapes.org/resources/Grapevine+Sources.pdf, which also listed Bert Dunn, although the pdf is dated November 2014.) But I contacted the owner, Duane, and he said unfortunately a late frost damaged his vines so he isn't doing Trollhaugen cuttings this year.
Tim
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