Where can i get an alloy wheel repaired if it has a chunk out of it? or where can i buy a single alloy?

i had a car crash and wen i went up the curb sideways i cracked a chunk out of my alloy, only one, i want to get it repaired as they are not insured. i either want to repair it or find a place that sells single alloys to match mine. i've tried ebay, cant find one.