I enjoyed every minute of my 1.5 hour "shoot" last Saturday. The Butterfly House opens their door an hour early for photographers, a couple of times per month. It's $3 extra on top of the normal $12 daily charge. Because I went there a bunch of times last year, I bought 10 daily admission coupons discounted to $60. There's no expiration date.
One reason I like this first hour is that the owner leaves the heaters and blowers off, which keeps the butterflies a bit lethargic and therefore more captive subjects.
Unfortunately many of the specimens I found were rather beaten up. The walls around the butterfly house are concrete block material, perhaps 20 feet high. The roof is made from glass panels. I recall someone saying that because the butterflies hover and rest frequently in the upper corners of the concrete walls that it is against the rough concrete that their wings get a bit beaten up.
Below are a few small images. I have a set of 22 larger images posted on my Web site, here: