Even at $99 a year, Amazon Prime is a great deal if you often order items from the giant retailer - the free two-day shipping alone is worth it for impatient types, and extras like a collection of free streaming videos don't hurt. Before now you could make your dollar go even further by sharing an account with up to four other Amazon customers (for a total of five). Alas, the halcyon days of that frugal fivesome are over: Amazon now restricts you to two adult users per Prime account.

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