By Dr. David Eifrig in Retirement Millionaire:

Although I'm a wine connoisseur (and an investor in a wine shop), I love cheap wine. And nothing quite compares to this stuff at around $4.50 a bottle: Banrock Station makes a Chardonnay that comes in a box to throw in the fridge.

The box holds three liters, or four bottles of wine. The wine could easily stay cold and clean-tasting in your fridge for five to six weeks.

The plastic collapses on itself and prevents too much air from getting in. This should be enough time for you and your spouse or friend to have a couple glasses a day for your health. If you're having a party, this is a great buy and your guests will love the taste, too. You should be able to find it in your local grocery store.

Want more "wealth strategies" from Doc Eifrig? Here's a cheap way to get silver...

More from Dr. David Eifrig:

How to retire in Florida for 50% off

The best tax-free investment you can make today

The gov't literally just stole money from people's 401Ks