Have an online store?
If you DON’T have free shipping, you’re missing a good bet.
Customers like it. It simplifies purchasing and seems like a discount (even though they know that the shipping charge is built into the item price).
Amazon, by far the largest online retailer (more than 10% of all online sales in North America) gives free shipping on almost all orders (just spend $25).
Is free shipping common? How about almost 50%:
Consider it.