Not off-hand I don't...it's been a few years since I considered adding any snakes. If I were you, I'd start a thread asking for suggestions here, then check them out.
There is also a CornSnakes.com forum that might have more- or other- suggestions. Take your time...check multiple photos, ask questions & verify reputations.
Also, there's several members here with LOTS of corn snakes...check the threads in the corn snake "forum"-they shouldn't be too hard to find.
So the store mgr. has now agreed to take back the snake & give you a refund? -Some will try to brush you off but when you persist,they co-operate...good job!