In case any one is looking for a source for Mazzei injectors, I found this site which seems to be somewhat cheaper than some of the other sources. I have not personally bought from them so can't say how good/bad this source is.
D&T Aquarium Supplies- Aquarium supplies for marine, reef, saltwater aquariums, freshwater aquariums and ponds at discounted prices
D&T Aquarium Supplies- Aquarium supplies for marine, reef, saltwater aquariums, freshwater aquariums and ponds at discounted prices