Here's one option
http://www.pirate4x4.com/forum/shop-tools/933359-lennox-metal-cutting-circular-saw-blade.html
I have to disagree w others above & say the chip tank does a lot.
Furthermore from the thread above Milwaukee blades are ~.070 while the Lennox is reportedly .125. Coming from a machinist's standpoint, I'll take the narrower kerf, less friction, tool doesn't work as hard etc.
But you can't argue w results and if the thicker blades are working, fine.