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Anthony S.The easiest Obak set to complete is the 1910 175 series. The only tough card in that set is Frank Miller (San Francisco). It currently sells at a premium, because one his descendants has purchased several of his cards.
The 1911 set is tougher, but doable. It'll just take longer. The Ten Million card will set you back several hundred. The Buck Weaver is even more expensive.
The 1909 set is pretty tough. The cards don't pop up on Ebay too often, outside of Buy It Now. It's been a couple of months since the last one. They do pop up in the auction house auctions. The most expensive card is the Chick Gandil, probably followed by the Mohler. The set always has about 9 horizontal cards which usually command a little bit of a premium over the rest of the cards.
The 1910 150 series set might be the toughest, but I don't get the sense it's too widely collected.