Browse by pen model, add each tip as its own line, and follow that tip's minimum and increment.
Apply for an account. We usually review it within 24 hours. Until you are approved you can still browse, keep a cart, and send sourcing requests.
After approval, place an order and add the delivery details. Unit prices and shipping appear on the order. Review them, then confirm. Confirmed orders stay in your account so you can order the same tips again.