Answer: I'm not aware of an herbicide to kill cactus that wouldn't kill the grass also. However, cactus have shallow root systems, usually no more than a foot deep. You could water around it heavily to moisten the soil, wait a day, and, depending on its size, it would come out easily. If it's a prickly pear pad type cactus, you can also cut back all of the pads at the nodes. If it's a larger speciman type cacti, you should have somebody remove it for you. Good luck!
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