Pat,
I get mine from an "Industrial Supply" place, the kind that caters to local industrial shops. The blades are Lenox (from lenoxsaw.com) the shop cuts them to what ever length you specify. Mine are NEO 7'9-1/2" 3/4" 3 hook. They are tough and cut logs and staves really well, and work well for even the ironwood and elms. Not ideal for fine fancy patterns but damned good for gettin bow material down to size.
rich