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robertTinker, Evers, Chance, and throw in Mordecai Brown (to a lesser extent) are a bit more expensive. Chance yellow portrait is very common though and can be found for relatively cheap. M. Brown Portrait is pretty tough.
Keeler and Chesbro are also two of the tougher hofers to find at cheaper prices.
I've always found Bobby Wallace and George Davis to be the easiest to find.
Willis throwing as well is fairly easy.