When ordering a minimum of 50 units (depending on the product), we can offer you a free proof copy of your creation before placing your bulk order. This allows you to check the print quality of your photos, proofread any text and make sure that you're happy with the layout. You can then make changes to your creation if you want to before placing the bulk order.
We would recommend that you check the print quality of your product when ordering fewer units as well, and we can then offer you a sample at a discounted price or a pdf-file of your creation to check the quality of your photos.