I agree with Nozferatu: I could give my friends some free advice on home audio and HT set-ups. Though I readily admit that I have a looooong way to go to reach the level of many of you, I know tons more than I did a few months ago, largely due to this site. I have a couple friends who have already asked me questions, and I've been happy to tell them what I know and happy to point them to relevant links on this site.
Other inexpensive gift ideas would include a lump of coal--I'm a nice guy, but I can think of a couple people who deserve one
--or a home-cooked meal. I'm a pretty good cook, and am happy to cook for friends. Wait--depending on what I cook, this one might get a tad expensive. Oh well, 'tis the season!
Chris