How does Ethan eventually manage to get the glue?

Ethan finally manages to locate the glue he needs at the Widow Homan's.

Denis’s commercial instinct compelled him to aver on oath that what Eady’s store could not produce would never be found at the widow Homan’s; but Ethan, heedless of this boast, had already climbed to the sledge and was driving on to the rival establishment. Here, after considerable search, and sympathetic questions as to what he wanted it for, and whether ordinary flour paste wouldn’t do as well if she couldn’t find it, the widow Homan finally hunted down her solitary bottle of glue to its hiding-place in a medley of cough-lozenges and corset-laces.