Is a lingering sense of disgust that makes "Buy Nothing Day" so especially appealing this year? That is, the deliberate decision to not shop on the Friday (or whole weekend) following Thanksgiving, in preparation for a trimmed-down or even shopping-free Christmas holiday. Certainly the campaign, long supported by Adbusters magazine, has special resonance because this is the same source of the poster that inspired the Occupy Wall Street encampment and movement. (They also do an anti-branding and "digital detox" campaign that I've seen many allusions to.)
And I won't fight the "but don't you need food" canard. Peeling back impulse shopping, therapeutic shopping, class-positioning shopping and stress shopping is the key. I'd buy oatmeal at any time, but am training myself to avoid so-called status goods always.
First step: get off of catalog lists. Even in these web-web-web days, I get many catalogs and I don't think I asked for any of them. Fortunately, most catalog merchants seem to know that bearing the cost of the printing and postage for no return is useless and so give you an easy out. I used to recommend calling the catalog centers, but increasingly you can opt-out by the same web. Plus, it's such a waste of paper.
Overwhelmed by them? You can start by going to Catalog Choice and opting out. I did, and suspect it has helped. (It can also help clear out the catalogs you get.)