I'm looking to launch a new service this week. $50 per month retainer fee for an on-demand crawling service.
Basically, I will be "on call" for any data mining work required. Up to 10-15 crawlers can be setup and maintained. Works out to be roughly $3 to $5 per crawler.
I would be lookign to only take on 10 clients total. Then look to expand that when I hire more people to help create crawlers.