They have the standard bagels, plus special ones at various times. Really, what do you expect? A real, good bagel or a donut shop, or a good restaurant, does not make the same items 100% of the time. People like variation. I'm sure if there was one type you liked, you could ask for it, and enough people do, they'd add it to the rotation. I had a spinach everything there last weekend. They typically also have Russian pumpernickel, which is my wife's favorite.
Pretty much any kind of bagel since they specialize in bagels. I got a poppy seed when I was there.
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