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I have seen some of the OEM Beretta flush chokes at SAIL http://www.sail.ca/ and have seen most of the other big box outdoors stores carry aftermarket (typically extended, ported, etc.). Based on what I've seen, you should expect to pay around $100 or more for a fancy aftermarket choke.
I'm currently leaning towards Briley, which has a few dealers in Ontario. Gagnon's in Oshawa http://www.gagnonsports.com/index.php is listed as a dealer. I've also heard about one of the outdoors stores in Kitchener selling Briley as well.
If you want anything tighter than the modified OEM flush choke, you'll have to look at aftermarket as Beretta doesn't offer any OEM chokes tighter than MOD that will safely shoot steel.
Canadian Waterfowl Supplies usually has a selection of Pattern Master Choke Tubes in stock or can get them for you.....http://www.canadianwaterfowlsupplies.com/collections/choke-tubes...not the cheapest chokes on the market but effective and well made judging from the one I bought.
I have a new Beretta SV10 Prevail that takes the Optima HP chokes. I'd like to buy a set of modified chokes for shooting steel shot, and I 'd like them not extended, but flush fit. Is there such a choke on the market?