I have had good results with the 3% peroxide that you get at the drug store. Mix it in equal proportion with household ammonia. As I said, the process is slower than using the professional stuff but it will work. If I were just doing a few small pieces, as I have to prep them to be dyed, then this seems most sensable to me. I think you should try and do it yourself. It is fun to work with tying materials and adjust them to suit your needs. If you are concerned, just do 1/2 of the patch of hair.