Rolls for Sliders in Denver?
I'm going to guess that most restaurants buy slider buns from Sysco or Shamrock. Maybe you can call one of these distributors and find out who bakes them. A longshot: There's an Entermann's Bakery outlet on E. Evams that also carries other brands and a Woinder Bread outlet north of downtown, just west of I-25. You might phone them too.
Sara Lee and some other companies have begun making slider rolls that are pre-cut. I've used their dinner rolls before and just cut them, and that worked okay... but yeah, the grocery store slider buns are coming around now that it's been a big trend for about 2 freakin years...
I also bake my own sometimes, just a buttermilk soft roll recipe... works pretty well.