Where to find used wide angle zoom lens for 1/2" Panasonic ENG camera?

I am planning a documentary that really would benefit from a wide angle lens for shots indoors in close spaces. I have a Panasonic AG-DVC200 and had been considering a wide angle converter for my Canon YH13X7.5K12U lens, but the added expense of a rail support system and matte box is something that I'd rather defer (though the system might be transferable when I replace my camera, I'd rtaher do things in stages).

So, I am hoping that I might find a used wide angle zoom lens that would fit my camera. The problem is that when I go to the Canon and Figinon web sites, all I see are current models.

If I could identify older models that might work for me, maybe I could find a used lens with a web search? Regardless, I'd lijke to know what it is I am looking for.

Any guidance would be appreciated. That includes dealers of used equipment I could check out and maybe a technical site that would list older models of lens for 1/2" SD lenses and their technical specifications.