I get mine at a place in Santa Ana, Ca. The place is called industrial saw blade or something like that..They are the best blades Ive ever used and they make them custom for whatever your material you are cutting and any length you need.. The sears "metal" blades lasted me about a week, these others go for about 2 months if I dont break em first.
If you give them a call Im sure they will ship a few to you.