I echo Syklyd, I think you should give it a shot yourself. I once made an attempt at fixing a 10 gal. tank with some silicon. It wasn't as hard as I thought it was going to be (though I did fail, but mostly because the glass was cracked all the way across). I think I got the silicon glue at home depot but I'm sure you could try some pet places for it if you prefer.
On the alternative, I think I remember seeing a sign at Aqua Serene about this once.