Knowing what ship can help. I have seen the selection grow quite a bit and it varies by bar location as well.
On the Dream Pub 687 has the largest choices, including the 687 which I think is made by Red Hook. There is also Kona Island, Shock Top, Jai Ali from Cigar City, and a few others I can think of off the top of my head. If you are looking for more adventurous beers like quads, double IPA, things like that, you will be very disappointed.