You could make your own similar device:
The Elastic Stretcher
Here's another one of those "passive" stretching devices, although this device shouldn't be worn all day without checking your penis frequently! This device is also similar to a few products on the market!
Here's how to create The Elastic Stretcher:
You're going to need all of the components of
The Sock Hanger minus the weights and one length of twine; but you'll need an elastic band- you could cut the elastic off of a pair of briefs- they work perfectly!
Attach the sock to your penis as described for The Sock Hanger, except not as tightly. Tie one end of the elastic to the empty end of the sock. Tie the other end of the elastic to your thigh, just above your knee.
This device is perfect to use if you're doing a lot of walking, since the act of walking while wearing the Elastic Stretcher will repeatedly and gently tug at your penis!