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Do believe it's a "window sash." LMC (www.lmctruck.com) gets $40 for them, for Blazers, at least ... donno if you have a K5 or a Burb. Gack, I just looked and the Burb ones are $95.
I would think junkyards, IF you can get a non-rusty one.
I find the LMC catalogs are invaluable not necessarily for buying things, but for identifying parts and their names. Page 27 of the Blazer catalog, for instance, has an exploded parts diagram of the entire tailgate window assembly and names for it all