I was searching worldwide, no chance, everyone having some, keeps 'em. Now I know why.
Had some jobs with them right now, there where many situations unsolvable without them, no matter how experienced the user is. At least the increased grip is worth it, was able to do crazy slopes.
But I live in a mountainous area
Mine where in horrible condition, remember: new! from Vermeer!
Right now I'm in negotiation with them how to deal with this mess. so be aware!