A year or two ago, US Airways ran their Grand Slam promotion where you can earn up to 100,000 miles for doing different things such as buying products from a list of companies, renting a car, staying in a hotel etc.
One of the products was TrackItBack.com, a 24 hour lost and found service. Each sticker was very expensive, about $20-25. These are useful for everyone but even more so if you travel a lot (more chances to lose and leave things behind).
The company even made the news: (Youtube link)
After everyone bought it, they went out of business and didnt tell anyone (link).
Someone in my family recently lost an iPhone so I decided to check to see if the TrackitBack sticker on my iPhone worked and I found out they were not longer in business.
I found out a new company called ID Sticker was offering 75% off to customers of TrackItBack (link), which left their customers high and dry. All you have to do it email info@IDsticker.com and include “TrackitBack Exchange for more information about the exchange” in the subject.
The new stickers cost $5 or $18 depending on the level of service you are want. The best bet is to get a multipack and use the 75% discount. An alternative where the stickers are cheaper and where the company has
been around longer is zReturn.com (no longer in business). I put these stickers on my keys, phones, camera, wallet, and passport.