You pay for the work done, a clean order in your store, not per page and not per seat. Start free with 20 POs, no credit card.
Try Dynition on your first 20 purchase orders, free. No credit card. You convert to a paid plan only when you are ready to keep going.
Every plan includes a monthly PO allotment, then continues at your plan's per-PO rate. Overage is soft, so your orders keep processing. At 150+ POs a month we move you to a committed contract below $3 per PO, and you keep processing at $3 until you sign.
Entering a purchase order by hand can cost $40 to $80 once you count rep time and the errors it introduces. At a few dollars per PO, Dynition pays for itself many times over. Your reps stop typing orders and start selling.