I do! I don't remember where I bought mine, I got it back in 2009. It's pretty easy to use- it's cylinder shaped with a little tray that slides out of the middle, that's where you put the drop of saliva. Then you let it dry, slide the little tray back in, look in the eyepiece, and press the button on the bottom to turn the light on. I'll post some pictures.
1- saliva microscope. Light button is on the bottom (purple)
2- microscope with slide tray pushed out
3- eyepiece and slide tray
4- view through the eyepiece showing full ferning