You can either sell them or give them for free by posting an ad online or putting up flyers in your neighborhood. You can also try using social media platforms, such as Nextdoor, to give away items for free in your community. Another option is to find someone who is looking for rocks or gravel for their projects. You can try asking family, friends, or neighbors if they are interested. If you cannot find anyone who wants them, you can try posting an ad online or on social media platforms.