The blade guides were about $25 a pair last I ordered from DoAll, which I don't think included shipping. Probably higher now like everything. But I think you're asking someone to make up a 45 degree fixture for their magnet just to touch up the end(s) of the guides...
Alternatives...you can also flip them over to use the other end, make them out of A-2 tool steel with just a bandsaw and milling machine and torch-harden, or make them out of mild steel and braze a rectangle of carbide on the edge for a guide that will outlast all of the other single-component designs.
