The cinelli XCR is raw steel, but it costs $4k. For that you might as well go custom, mosaic and firefly make my favorite raw frames.
Twin six makes raw TI road, rando, and cx framesets:
https://www.twinsix.com/collections/bikes-bits
Otherwise, I think bikesdirect has a few raw TI frames, but I don't think you can buy just the frameset. Your best bet is probably to get a frame off craigslist or ebay and strip it yourself.