Craigslist the non-cheap stuff. It only takes a few minutes to post something there (less time than going to Goodwill, probably), and you'll get some cash.

But yeah, the gifting culture drives me kind of bonkers too. I intend to establish Gift Truces with as many people in my life as possible come January 1st of 2014 (since, mathematically, I should be even with most people at that point). Or, if a person won't go for that, I'll ask them to donate to charity in my name instead of give me a gift.