The Forsyth dirk is splendid.

My first sgian dubh is from APS.

I actually bought this before anything else. I lived in Cambridge at the time and just around the corner from my house was a small, local, gentlemen and academic clothing tailors called Stuarts. It was like how Olivander's is represented in the Harry Potter movies - very old school and charming. They also specialised in highlandwear (I guess the name was a giveaway) and I went there to hire a kilt for the local trainee solicitors group (the highlight of our social calendar and being the president I felt I needed to make an effort). The hire did not include a sgian dubh but one of the ones he had on display caught my eye. I think I paid about £20 or £30 for it back in 2000. Still my favourite.