KlingOn Semi-Permanent Fret Dots ($3.75 with free shipping in North America) I'm using these Kling On Fret Dots ($3.75 with free shipping in the US/CA) on the face of the fretboard rather than the side of the neck, so my students can see where I am playing. They are a little tricky to apply but seem to be holding up well with use. Kling On Semi-Permanent Fret Dots ($3.75 with free shipping in US/CA) Ed Kling On Fret Dots FDS8$3.75 Black Cat Fingernail Sandpaper Black Cat Fingernail Sandpaper BC101$3.95 Oasis Digital Hygrometer/Thermometer Oasis Digital Hygrometer/Thermometer OH-2$27.95 Gitano Guitar Support Gitano Guitar Support G1001$33.95