I did some research on the carp and found a nearby fish farm that is certified to sell them. They do muddy up the water though and I just don't like carp in general but I might go that route. A lot cheaper than any of the chemicals I have been looking at and probably safer. Tilapia are highly controlled in IL. Our rivers are infested with those Asian jumping carp so I guess they don't want to get tilapia in them too.
