Tell you what, those blades really don't look that bad. I use an angle grinder with a sandpaper disk on it like this:
to fix and sharpen my blades. Much easier than a bench grinder, and easier to get a good edge. I've seen blades that had been ground nearly half way across, and still in use. Those really don't look bad to me at all. I'd put a new edge on them and keep using them.