@Kevin Schmit , @traider You convinced me! Better to have raw data and full control over the "stitching" algorithm.
I don't know anything about these people, but they're local to you, and could probably burn/hand you data at a moment's notice, and make any changes needed, without a big deal. https://www.meetup.com/Option-Trading-Strategies/ (There may be others -- I just stopped when I hit them.)