That's not something that's going to be easy to find. This is an uncommon machine and it's the first one I've seen without the bobbin winder. Your best bet is to set up an Ebay search. I'd do something like "Long shuttle zig zag machine". This machine was badged under several different names so a name search might not show it. Dressmaker, White, Morse and Universal are just some of the names this machine was sold under. here's a pic of mine so you can see what it looks like. Mine is also a Dressmaker, but mine is unusual in that it takes cams.
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Cari