BlackHole exploit kit is yet another in an ongoing wave of attack toolkits flooding the underground market. The kit first appeared on the crimeware market in September of 2010 and has quickly been gaining market share. Many antivirus vendors now claim that this is one of the most prevalent exploit kits used in the wild. You can rent the kit (on the author’s servers) for $50 for 24 hours, $200 for 1 week, $300 for 2 weeks, $400 for 3 weeks, and $500 for 4 weeks.
Source: https://thehackernews.com/2011/05/blackhole-exploit-kit-download.html