These products are found in the Core catalog under prints and enlargements. The paper type option (watercolor, canvas, etc.) is under options/paper type.

SizeWatercolorCanvas
5x24$ 35.99$ 57.50
5x30$  39.99$  61.50
8x8$  5.69$  31.80
8x10$  5.69$  31.80
8x12$  9.79$  31.80
8x16$  10.99$  34.20
10x10$  7.49$  31.80
10x13$  9.99$  31.80
10x15$  11.29$  34.20
10x16$  11.99$  34.20
10x20$  22.99$  39.00
10x30$  43.49$  94.20
11x11$  11.29$  34.20
11x14$  11.29$  34.20
11x16$  16.19$  39.00
11x17$ 16.19$ 41.00
12x12$  10.59$  31.80
12x16$  13.59$  39.00
12x18$ 16.19$ 41.00
12x24$  37.99$  67.80
14x22$  39.99$  81.80
15x30$  59.99$106.20
16x16$  37.49$  69.00
16x20$  37.49$  69.00
16x24$  54.99$  82.20
20x20$  55.99$  82.20
20x24$  56.99$  82.20
20x30$  65.99$106.20
20x40$102.99$179.50
24x24$87.49$118.00
24x30$87.49$131.20
24x36$117.99$158.00
30x30$117.99$173.00
30x40$120.49$180.00
30x45$141.49$210.00
40x40$219.99$240.00
40x50239.99
40x60$249.99$252.00
48x72$279.99