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I just made a stout with American Ale II and really liked the results. It gave a bit of a citrusy flavor that goes very well with the chocolate and coffee.
Ideal temperature for that yeast is 59-68, but their website says you can go up to 77, so I'm thinking you should wrap a wet towel around your fermenter and you will be fine. The temperature can rise up to 10 degrees during fermentation, but keeping that towel wet and maybe even blowing a fan...
At what temps are you mashing? A higher mash temp will yield more dextrins in your wort, which are unfermentable sugars, so they stick around and give your beer some viscosity.
True, it was definitely the extreme example. But as usual, I'm going to pimp my favorite bucket:
http://www.usplastic.com/catalog/item.aspx?itemid=24116&catid=626
Put beer in, blanket with CO2, seal it up, place in lagering chamber.
P.S. I hate carboys
Your beer is perfectly fine. Yeast produce C02, which is heavier than oxygen, so even though you introduced oxygen to the fermenter, that C02 should protect your beer some.
http://www.anchorbrewing.com/blog/anchor-terminology-coolship/
Look at the headspace on these fermenters, and remember...
I don't usually check it until my airlock activity has stopped completely, usually a week, sometimes up to 2. Just be patient and let the yeast do their jobs, and you should have some great beer!