I signed up for Amazon Prime a few months ago because I had an opportunity to split the $80 annual membership fee with a few other guys. Since then, Amazon.com has been getting plenty of business from me. Prime gives you free 2 day shipping and overnight shipping for $3.99. I never order overnight shipping, but occasionally I magically get my items the next day if the assigned shipping center is close.
I even do household shopping from Amazon now for things like shampoo and detergent. I find that Amazon has slightly cheaper prices than retail at the supermarket, not to mention that I don’t have to waste any gas driving out to stores. It’s win win for me. $80 a year is a little steep though, but it’s definitely worth it if you can find a few buddies to split the cost.