I bought a set off ebay, but after trying hundreds of times, many different ways, none successful. I'm real surprised I can't get em working, the videos make it look so easy.
All those videos saying you can file your own are a bunch of bull, unless you can file very precisely, there's a very slim chance you will be able to file a regular key into a bump key. So that's why i bought a set. Nothing doing though, can't open any locks. I've tried filing the tip and shoulder of the key (although you shouldn't need to anyway unless you're doing the minimal movement method). The keys are all perfectly cut, but I can't get them to work anywhere for some reason. I'm thinking bump keys might be overrated.