There actually are a few truffle "farms" operating in the pacific northwest. Forests full of trees producing white and black truffles.
Only problem is, the white ones they grow are generally not the same truffles you get from Alba, they're
tuber gibossum and
tuber oregense (oregon white truffles) and
tuber borchii vittad (bianchetto white truffles). The Alba truffles are
tuber magnatum. The bianchettos are the same as the white truffles from Tuscany, and are said to be inferior to the Alba truffles. I wish I could say that from experience