A lot of people don&39't know you can share your Amazon Prime membership with up to four household members.

For those of you who are planning to do a lot of last-minute online shopping on Amazon.com this year, here's a little tip. If you own or are considering purchasing an Amazon Prime membership ($79 for the year), which enables you to get free two-day shipping on a whole host of items in Amazon's catalog, you can actually share your Prime membership with up to four "household" members. A lot of people don't know about this option because it's buried in the settings menu under "Your Account."

To get there, just click on your "Your Account" (it's a little link in the top-right corner of your screen when you sign into Amazon). Look at the "Settings" section, and find "Manage Prime Membership." Once you click on that, you'll be able to send invitations to folks you're close to. You just select your relationship, and enter an e-mail address and a birthday of the recipient to send out the invitation.

Of course, some people balk at paying $79 for Amazon Prime, but if you could share the cost with a roommate or just be a generous family member, it starts to look like one of the great bargains, especially if you use Amazon a lot.

Anyway, that's my free Amazon shopping tip this holiday season. Hope it helps.