When the S55, 56 series of Berettas were made they were not particularly cheap guns, but priced by the level of finish and quality of wood. Beretta never sacrificed quality of metal parts and reliability for price.
Unfortunately there are very few parts for S55, 56 Berettas. Fortunately, they rarely need parts unless worn out.
I am sure there are fair value for dollar shotguns from Turkey. The problem is sorting the good from the dross. With the usual inadequate warranty support in Canada, buying a cheap O/U is a crap shoot.
Geraltao did point out one opportunity in cheap shotguns - if you can get over their lack of refinement, Baikal shotguns have a reputation for being built like a tank, and very reliable and cheap. The country has been flooded with surplus Baikal over/under shotguns from Scandinavia.
One thing to remember about buying shotguns from Scandinavia. When Swedish hunters are getting rid of guns to meet the limit they can hold, they are mostly getting rid of their problem, low end, or damaged, pitted guns. You have to pick and choose, and even get lucky, to get a really good gun from this pool of imports.