Of course customers want free shipping; in fact, 85 percent of them are willing to accept a five-day delivery time frame to get it. Your decision as to how to price your shipping options should be based on a combination of what your particular customers want and what your business model can support.
Here are the typical pricing options and key points to consider for each; notice that if you offer multiple service levels (see previous section), your pricing model will need to reflect these options.
This article is from The Definitive Guide to eCommerce Shipping