Sahti Nordic beer

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Sahti is a wild fermented beer aka sour.

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Not all wild fermented beers are sour, if you want to be technical.

In terms of finding some, i don't think you'll have any luck in BR. Jester King makes one, i think, but you'd have to find it when it's available and your best bet is in Texas. If you are looking for something with Juniper or Spruce, Le Chien Brewing in Denham Springs is making an old ale with Spruce tips. Not sure if it will be released this year or next, though. Grimm Artisan Ales out of New York ships here. They have a spruce gose called Super Spruce, that is fantastic. Not sure if we'll be getting the shipment locally. I've made a spruce tip sour gose 4 times now, mimicking Grimm's Super Spruce. Actually about to tap the keg of it this weekend.

ETA: The spruce tip old ale is actually on tap at Le Chien now. It's called Bruce the Spruce Moose.

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I've had sahti from about 10 different brewers and they have all had a good tartness.

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I'm talking about wild fermentation in general. Wild does not necessarily mean sour. But you're right, likelihood of traditional sahti's being sour is pretty high. And i'd say the style nowadays may mandate acidity.

ETA: Actually, per the BJCP

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Sourness is not appropriate for this style.

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There are a few breweries that make it the old fashioned way, by pouring the beer through a hollowed out tree lined with spruce after the mash/boil. It's pretty interesting stuff.