I think $30 for a Floyd Rose intonation tool that actually works, is reasonable enough, Stewmac sell an intonation tool called "The Key" for less money, but I've got one and to be honest, while it does seem to work okay it is a bit finicky to use because it keeps slipping out of adjustment under spring/string tension, so I'm fine with paying some extra money for a Floyd Rose intonation tool that works a lot better than The Key.