We don't have links to maps here other than official Garmin links for you to buy from them legally. That's because of the forum's rules. You can search google for other sites which do freely post them.
SP c3x0 devices can only use a map IMG file named gmapsupp.img in a Garmin folder on an older SD card formatted FAT32 or FAT16 (not an SDXC, formatted exFAT). The IMG file must be 'unlocked' and less than 2 GiB (2,147,483,647 Bytes maximum). You can simply copy/paste such an IMG file into a Garmin root folder on the card connected to your computer, then insert it into the SP.
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