Prices and sizes per copy are available as follow:
4x6 = $5.00
5x7 = $7.00
8x10 and 8x12 = $10
11x14 and 12x18 = $15
16x20 = $30
18x24 = $35
20x30 = $40
24x36 = $50
Finishes are glossy or matte.
My suggestions are glossy finish because it shows clearer detail.
For events such as team roping, because they tend to be stretched horizontally, sizes 8x12 or 12x18 look better with less extaneous material at the top and bottom. There's more action in the picture. The trade off is the difficulty in finding readily available matting and frames. Custom framing will be more expensive.