I sell 8x12 prints on 11x14 paper matted to 12x16 for $250 and 12x18 matted to 20x24 for $350. My 5x7 platinum prints are generally in the $250 range, and whole plate (6.5x8.5) and 5x12 are $300. As I'm just getting started with gum bichromate, I haven't set pricing on that yet.