Don Soderberg, Frank Pinello, Rich Zuchowski (aka bleep), and Kathy Love would all be good choices to get your cornsnakes from. If you live in Oregon, Clint Boyer would be another one, but he doesn't ship.
Of the group, I've heard the best bloodreds come from Don. I've not yet had a chance to raise one up and see for myself (just got a hatchling), but Don's a great guy and is extremely helpful. Frank's up there too... one of my friends had a bloodred from him, and she was a killer bloodred too.
But everyone I listed is a good choice to buy from in general.
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"You keep WHAT in your freezer?"
"Mice. And rats. If that bothers you, I can call them 'cows' instead."