One of the most attractive benefits of subscribing to Amazon Prime is the free two-day shipping or an overnight option available for a small fee, depending on the item and destination. But in many cases, you might not need your stuff until the following week, making the e-tailer's new "no-rush shipping" option appealing. If you opt for Amazon's slowest delivery speed, you'll also be rewarded with a $1 Amazon Instant Video credit. Credits do expire, and certain content is excluded, such as HBO titles. It's a "limited time offer," according to the site's terms and conditions, but considering the cost savings for Amazon, it wouldn't be unreasonable to expect the incentive to remain.