Dermal Tone facial exercise treatment, $5.

Per the (now defunct) Dermal Tone website: 'The Dermal Tone™ Facial Exerciser is an electronic device which sends out tiny amounts of harmless electricity to designated areas of the face which cause the muscles to flex and relax, effortlessly exercising them for you. The facial muscles are then strengthened and toned as they lift and tighten your skin. Just as physical exercising and strength conditioning can keep your body toned and fit, you can also use the Dermal Tone™ Facial Exerciser to strengthen and tone your facial muscles.'

The first time I saw one of these Dermal Tone machines was at one of those yard sales where it's easy to let your attention wander, especially if you're a guy. There were lots of 'arts and crafts' goodies, Walmart wine glasses, and the usual complement of trinkets and doodads that can lull you into thinking there's no money within miles of the place. But then I saw this Dermal Tone sticking out of a pink handbag, right there on the doodad table in front of me! I don't know how I missed it in the first place, but it sure was a wake up call to me that I have to be more observant.

It's very important to note something here. These machines originally cost around $179 from the Dermal Tone website, and until a few of years ago, they were selling on eBay for around $75 to $100 used. But back in 2006, the FDA's Center for Devices and Radiological Health apparently got onto the folks at Dermal Tone and shut down their operation.

A quick check of their former website (dermaltone.com) will reveal, well, nothing. They're gone! And as opportunity would have it - you guessed it - people still want these things! And where do you think they will find them nowadays? Right, on eBay. Today, these same machines that used to sell for under $100 are going for well over $150 - more than what they cost to buy new! Supply and demand 101.

As always, there are a couple of warnings here:

Notice that the desirable machines have three metal contacts. There is a version of this machine that only has two contacts, which sells for much less than the three-contact version. So be careful!

The Dermal Tone works with either AA batteries or the wall unit. If you can, turn it on to make sure it works before you buy it. If the batteries are dead or missing, plug it in. The red lights on the front of the Dermal Tone unit should light up if it's working. If you're the adventurous type, try it out on your face. It doesn't hurt, all you should feel is your face twitch a bit. Bzzzzzztttt!

Although any of these Dermal Tone machines will sell for something on eBay, your buyers really go for the boxed machines that are a complete set. So, try to make sure that all the components, like the VCR tape, the wall adapter unit and the lotion, are all present and accounted for.

So there you have it. Don't let another area of profit opportunity go untapped just because you can't see the cash when it's staring you right in the face. The key? You guessed it - strive to learn at least something about as much of this big, money-laden world of opportunity as you can.

This Dermal Tone facial massage unit sold on eBay for $168.

Photo of Dermal Tone facial exerciser massage unit