Make magazine has just put up its $20 and under holiday gift guide, chock full of starter electronics kits like a barebones Arduino and tools for your favorite tinkerer. Or if you're the only one who solders in your circle, pick up a few kits now and give away the finished product.
I've built a number of kits from Make and they're a great way to learn and hone your DIY electronics skills, with super-clear instructions. After the jump, I add my five additions to their list, with an eye toward encouraging the young hijinks-prone Makers-in-training on your list.

2. Fire Piston kit
$20
I was just talking with our resident mad scientist Theo Gray about doing a column on fire pistons, a very cool way to start a fire with basically nothing but pressure.

4. Barrage Garage Vo1. 1 DVD"
$19.99
You can't go wrong with anything from DIY crazy man Bill Gurstelle, whose other projects feature titles like Backyard Balistics and Absinthe & Flamethrowers.

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Science is reinventing play, from extreme sports to gamification to ridiculous roller coasters to the playgrounds of tomorrow, and this issue is chock full of fun. Also, on a less fun note: Did global warming destroy my hometown?
Real Fine unless i is from OK!
I need a plumb defusser fo sure!
Waz do I have to ax you to win won?
What does a stupid presidential T-shirt have to do with electronic gadgets under 20 dollars? Seriously?
...somebody's a republican.
seriously is right, who cares about a t-shirt?
Actually no, I'm not. I hate politics. And I hate government. ALL OF IT. That means BOTH sides. I have no horse in this race. But I can see you do. Please enlighten me as to what a T-shirt has to do with:
"Great Gifts For Electronics Geeks For Less Than $20".
As you just mentioned, the title is "Great Gifts For Electronics Geeks For Less Than $20;" it's not "Great Electronics For Less Than $20." So a t-shirt isn't that out of context.
The quote has to do with engineers/hobbyists who make stuff. Those guys might like that quote on a tee. I'll say that they could've completed the sentence or something to make it a better t-shirt, but it still is pretty clear that the quote can be applied to hobbyists (i.e. electronics geeks).
What you should be worried about is that 3/5 of these items are not less than $20.
For real does Mike Haney not know how to count? Under $20?? Last time I checked $39.95 is not less than $20. Hey Mike can I have $20?