My Gen Con tips from last year contain this piece of advice:

There is a CVS about three blocks from the convention center. It is your best bet for inexpensive bottled drinks, snackfood, cigarettes, Red Bull, and condoms.

Jonathan Medina (@mtgmetagame) had this to say about that advice, yesterday:

Just read @adamjury’s GenCon Tips -> http://tinyurl.com/39q4jvm Favorite Part “There is a CVS about three blocks from the convention center, It is your best bet for inexpensive bottled drinks, snackfood, cigarettes, Red Bull, and condoms.” Condoms?! Really at GenCon?! lol
(Part 1, Part 2)

I think Medina is a cool guy and I enjoy this writing, but naturally, his tweet ended up getting him a good handful of “Why on earth would Magic players need condoms?”-style replies.

I gotta ask: gamers, Magic players, why do you feel the need to self-hate? Yes, there’s things in the gaming community to dislike and discourage, but here’s the thing: Self-hate may look to you like an in-joke when it’s limited to your “tribe” but those on the outside will take it at face value, and all those stereotypes will continue to be perpetuated. If you want to rise above the “smelly/hopeless/loveless/jobless/etc. geeks playing that dumb game all day” stereotypes then you have to show the positive side of yourself and your hobbies—not just putting on a show to non-geeks, but by treating your fellow gamer better, and treating them as complete human beings: including love and sex lives. People will notice how you treat other people and form opinions of you based on that, not just how you treat them directly. Geeks treating geeks well will raise their profile among non-geeks (and for a direct bonus, it’s usually more fun to hang out with people who are treating you well!)

And Jonathan, if you need the most important Circle of Protection at the show, hunt me down at booth #2009 (Posthuman Studios, Sandstorm Productions, WildFire)—I always have a couple handy.