Problem is - I don't really want the glass patio-style doors that are often used. They're more expensive than a regular slab door. I don't want or need glass in the doors (there's nothing for me to see on either side). And aesthetically, I prefer something more trendy/rustic, like a barn door:

The problem with a barn door (or a pocket door) is that I don't know how you would seal them. In fact, poor sealing seems to be one of the big drawbacks of barn doors in any venue.
So, does anybody have any pointers on where to find sliding doors that aren't glass? Or where to find barn door hardware that seals? Or something else that I should be looking at?