I have found the following derma stamp like devices for sale. Of the Chinese ones, there are many sellers but a limited number of different devices.
Chinese (found on dhgate, alibaba, ebay, etc):
Screen Shot 2017-06-12 at 4.42.21 pm.png 264.53KB
3 downloads
(red and white with dr pen in black text)
Screen Shot 2017-06-12 at 4.42.29 pm.png 178.93KB
3 downloads
(looks exactly like the dr pen except with MyM in black text instead of dr pen)
Aluminium Dr. Pen or Dr Pen Ultima A6
Screen Shot 2017-06-12 at 4.42.41 pm.png 360.7KB
3 downloads
(metallic body with red or blue metal ring)
Screen Shot 2017-06-12 at 4.42.52 pm.png 184.58KB
3 downloads
(metallic or plastic metallic body with black caps on either end)
Screen Shot 2017-06-12 at 4.42.56 pm.png 451.25KB
3 downloads
(hand held, smaller, all white plastic device)
Of these the derminator is as much as 10 times more expensive than the others. A page on the site that sells it though shows evidence how cheaper devices cause "microtearing" and calls the other devices "cheap chinese buzzers". Micro tearing is bad as it may cause (according to the site) enlarged pores, less efficacy and more negative side effects.
Has anyone tried one of these? What do you think?