Other than a couple of internet sites, I haven't been able to find bulk heads at local stores. I would like to be able to SEE them so I can make sure I buy the right size.
any plumping stores, or the LFS should be able to get them in. but my first trip would be to an irragation & plumbing store.
just give them the size pipe & they will point u in the right dirrection.
When all else fails, I'm an eBay fan. Whatever it doesn't show in the pic, or say in the listing, email the seller. I've probably bought a half dozen bulkheads there. You may need to search more than once on different days.
For something like a bulkhead, I would add the word aquarium to it, to narrow the search.