Stationery and Cards products like Roll Fold Brochures, Flyers, and Folded Cards are priced per set of 10, not individually.
The price you see in the catalog applies to 10 printed items. For example:
Selecting 10 = 10 brochures
Selecting 20 = 20 brochures
When creating an order, make sure the quantity matches the total number of pieces you want printed.