I agree with hitting the used rack at a good, reputable gun shop/store. I know personally that a store in my area has quite a few O/U's sitting there. Ask for a professional inspection and / or warranty period. You can probably pick up a GOOD quality gun at a fraction of what you would pay new.
If you're not worried about getting the factory box and documentation with it, this would be a good way to go. Been there, done that.