You can find a 28ga Repro if you take the time to look. Just watch all the usual internet dealers. I recently bought a two barrel set (DT/BTFE/PG) that may have been fired a few times but there isn't a mark on the wood and the case colors look perfect. I'd hardly classify it as "used", "as new" would be more like it.

I have a 20ga Repro in a DT/SPL/SG configuration and decided the opposite configuration in a 28ga would be fun. Turned out I was right and I am throughly enamored with the 28. And I like the way the BTFE fits (beautifully) and not having to wear shooting gloves when the shooting heats up. Don Moody is right - live with it - you might be surprised.