26" tires are plentiful, but 650b/27.5 tires, especially dirt ones, are no longer a scarcity. All the major tire makers have multiple lines for multiple uses. I was on a online retailer's website and there was more than 150 different options. And they don't make some newer fancy tires in 26" anymore. For example, schwalbe's new Big One/S One tires, which are either 60 or 70mm wide, weighs less than 600g per, and have low rolling resistance, are only available in 29" and 27.5.
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