Grandpa, to the best of my knowledge, Franchi does not make a SxS (they advertised one for a while, but none shipped). Beretta only catalogues 1 SxS in 28 gauge, and that is the Imperiale Montecarlo model - verrry pricey. The Weatherby Athena D’Italia is available in 28 gauge, but weighs 6 3/4 to 7 1/4 lbs. - too heavy for a 28 gauge.
The CZ Bobwhite is the least expensive scaled frame 28 ga. SxS that I know of, and available in Canada. Ugartechea has a few to choose from, but you will have to import them from the U. S. - it will take a little time. Other Basque makers such as Grulla, AyA, Arrieta or Garbi can make you what you want, but again you have to import.
If you are looking for a 28 gauge SxS you have good taste, I wish you all the best.
Sharptail