Best deal for nut files in Canada?

Filing nut slots on my own: bad idea? nut slot files V shaped nut slotting file set; Hosco Brand nut slot depth I also had good luck with pre-slotted graph-tech nut on my LPs I have a set of these Hosco files, I've done 3 or 4 nuts with them and they

nuts and bolts slot Files GMC Luthier Tools, UK The Guitar Nut Filing Set is a versatile trio of high quality tools for marking the string positions and filing the nut slots