If there’s one thing Americans love, it’s free shipping. This shopping perk has gone from a rare bonus to almost an entitlement in consumers’ minds. Nearly half of transactions last year involved free shipping, and 61 percent of consumers say they will cancel their purchase if free shipping isn’t offered, according to a recent comScore survey. There’s more than one way to offer free shipping, though. Each has its own drawbacks and advantages. Here’s a look at seven types of free-ship offers, as compiled by the website FreeShipping.org, which collects information on free-shipping discount codes. Read more.