Paul said the dulcimers have a regular wooden fretboard and regular tuners. I guess I was thinking it would be an easy way to teach keiki in case their attention waned after a while...that way no great expense was made. But now that I think on it, no reason to go to all that trouble for cardboard.
I picked up a "Sponge Bob" plastic uke at Toys r Us. It tuned up nicely and actually had geared metal tuners. Tone was what you would expect but it was playable.