Attended the Assembly Required con in Des Moines last weekend. It was a blast, and I got some cool swag to boot:

A bunch of perfectly mint vintage Joes: Quick Kick, Budo, Falcon, Jinx, Cobra Commander, Toxo-Viper, Techno-Viper, and Laser Viper. The full cards were a bonus, and none of these cost more than $12.
But the best part was these two:

JoeCon 2011 Python Tele-Viper I bought from one of the dealers, then a preproduction Retaliation Sneak Attack Storm Shadow! (At least I think that's what Hasbro is going to call it.) I won it in the raffle, so that was a pretty sweet bonus.
If you're in the area, I'd make the drive to next year's gathering. It's small for now, but the deals to be had on vintage and modern are incredible, plus the store hosting it (Jay's CD & Hobby) is one of the neatest places I've ever been.