FMc...2-4-D has been in use for a long time in and around ponds and fields as a selective herbicide. It is relatively inexpensive and can be found in co-ops and many other places. I find it works similarly to glyphosate, but does not have the problem of some of the glyphosate brand surfactants. Glyphosate is non-selective, though. What, in particular are you looking to control?

I believe I read that granular version is no longer sold...but could be wrong. Maybe someone will clarify.