Depends on how much you want, but....Highly rated good beers. New beers/seasonals. Limited locals...for example, your username...or a regular trading partner.
I just recently traded for a case to take up to Darkness Day. Sent some Le Terroir, DDBA, BB XXV, & some local seasonal IPAs. I did have more than one response asking for the Terroir so you may have luck with it. Like others said though, Abyss would probably work pretty well too.
Ht isn't easy for a shelf beer available in volume. Go figure, but it's still a reasonable drive for most of the far northeast
If you live in Washington you'll have lots of shelf beer options that will land you Heady. Deschutes: (the aforementioned) Abyss, Green Monster, The Dissident, Mirror Mirro maybe also The Stoic or Black Butte Anniversaries. Hair of the Dog: basically everything but may require quantity for some. FW: Anniversary, DDBA, Sucaba, Parabola, Merkin. Sound Brewery: most of what they make. Big Sky: Ivan the Terrible, Old Bluehair. Great Divide: maybe a bunch of Yeti variants?. Boneyard: growlers of the IPAs might entice some people as might stuff from Gigantic. maybe also Cascade stuff that doesn't sell on their website? Long ago I got 8 HT for 2 Parabolas once (you can find Parabola on shelves) Another time as part of a HF trade for Bruery stuff I added a Deschutes DDBA (also a shelf beer) and got six HT. Make a post advertising a few of these after you acquire them and list how many HT you want. You'll probably get some bites. Eventually, I'd say the best thing is to try to find an "Upstate NY" (Eastern) trader or a VT or New Hampshire trader. Send him/her a lot of extras (check their wants see if you can meet some as a surpise) and be super nice and a good trader the first time. Maybe you can establish a relationship and then you'll have access to it more often. Good luck.
The Abyss would definitely work, plenty of us Bostonians can get Heady and would definitely have interest
I did a small trade earlier in the year for some Headys - 2 Abrasives for 2 Headys, plus we each added some extras.