Verisign allows you to redirect traffic to it's scrubbing centers, blocking malicious traffic and allowing legitimate visitors to your site without interruption when a DDOS attack is detected. It manages the service using the cloud.
The pricing is defined for Akamais Kona DDOS as such. Though the yearly subscription can cost approximately $7k yearly. The setup cost is around $3.5k.DDOS Protection Services Akamai Kona Site Defender
As per the stats of 2016, Imperva Incapsula DDOS has no default pricing but their average pricing cost around $4.5k yearly. The set-up cost is estimated to be around $6000.DDOS Protection Services Imperva Incapsula
The cost of F5 Silverline (cloud-based) platform with subscription license for 1 year is around $12,290. Though, the pricing may vary based on the amount of clean traffic that one (customer) typically uses. In that case, contact F5 Sales rep at 866-329-4253 or +1 (206) 272-7969DDOS Protection Services F5 Networks
A DDoS attack shuts a business down, commonly by overwhelming/exhausting the company’s network or website. In addition to installing DDOS protection services, teaching your staff what DDoS attack traffic patterns look like andDDOS Protection Services