There's a digital Soligor on E-bay right now that's up to $183.01.

The Zone VI modification theoretically involves(ed) more than just the sticker. I say theoretically because I've heard stories, but it is/was fairly involved and included adding a U.V. baffle and a filter pack to modify the meter's response to that of B&W film. If you want a complete run-down on this you might try the Calumet web-site. Or, I could e-mail you a verbaitim quote from the last Zone VI catalog.

I am not a Zone VI advocate or detractor, just relaying info.