Do you offer shipping options?
The more control you give your customers over a transaction, the more comfortable they'll feel about doing business with you. One easy way to offer more control is to give customers a choice of shipping options on their orders. Rather than using only parcel post or UPS ground, for example, offer 2-day or overnight delivery for an additional charge. Some people are happy to pay a little extra to get their shipment more quickly, and even those who aren't will appreciate having the option.