Holy Mountain bottles are hard to find in general. I don't believe they produce that much beer. Malt & Vine will have them, but more often than not you won't see any on the shelf. I believe they had The Seer when I was in there for the Instant Karma release.
The majority of HM bottles don't leave the brewery. The Ox and The Seer do see retail distribution and should still be around if you look hard.
Hop & Hound in Bothell seems to have a special relationship with Holy Mountain and has a steady supply but of course that's Bothell not Sammamish. That's the closest I can do. Edit: Ask the beer buyer at Metropolitan Market in Sammamish if he holds anything in the back. He might surprise you.
You will find Holy Mountain on draft and bottles at The Cave Craft Beer Store on 85th Street in Kirkland. I was there two days ago and nothing in stock. But, Holy Mountain has been in stock many other times. There are plenty of bottles of the following two around greater Seattle area: The Ox, The Seer, and possibly Witchfinder (not sure). Look at grocery stores like Central Market (Mill Creek & Shoreline), Brigids Bottle Shop, Whistle Stop Deli, Stogies & Hops, A-1 Hop Shop (104th Greenwood), and a few other places I can't quite remember. I have seen Holy Mountain bottles at these places recently. These places are not too close to Sammamish. But the drive will be worth it to travel the city for Holy Mountain. Love the new Metro Market in Sammamish. If the buyer develops the beer department like he did the liquor department......watch out! The Kirkland Metro Market occasional has some real gems. Don't overlook QFC in The Klahanie Shopping Center bordering Sammamish & Issaquah. Same with the QFC around 8th street downtown Bellevue. Good luck.
Take a trip over to holy mountain on the weekend. Most if the time whatever is in disto is behind the bar and a little more that isn't is likely.
