Some of my favorite oddball non-card Cobbs are...
1911 T332 Helmar stamp - I paid less than $100 approx. 10 years ago. You don't see them too often. Mastro or REA have had a few examples in the last 10 years or so and topped $500, if memory serves correct. There is one on ebay SGC Auth with BIN of $650.
1909-12 PX7 Sweet Caporal (Domino discs). I don't think I've paid over $200 for any of mine. There is one on ebay from the same seller as the Helmar stamp with BIN of $995. I have seen non-graded examples sell in the $300 range and high-grade graded examples being offered for over $1000 on ebay.
Mike