Both Uses

stationery
in
Atlas Shrugged
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He never lifts a finger around the house, just sits in his store all day; a lousy little two-bit stationery store-can it compare in importance with the book I'm writing?†
Chpt 1.10 *

stationery = paper and envelopes for writing letters
The fraudulent weapon of sarcasm now seemed to sound less effective than ever, but it was Dr. Stadler's only weapon: "Why did you find it necessary to send me messages on official stationery worded in a style proper, I'm sure, for Army"—orders, he was about to say, but didn't—"communications, but certainly not for scientific correspondence?"†
Chpt 3.3

Definitions:

(1) (stationery)
paper and envelopes for writing letters

Stationery is commonly confused with stationary; i.e., remaining still. The words are pronounced identically, so be sure to note the spelling. It might help to remember which is which, by thinking "First sit still; then write."
(2) (meaning too rare to warrant focus)