At first we searched on twitter/linkedin for companies that seem to get into trouble more than once; hacked, downtime etc. Also down adsense links of big companies (click on the link -> they pay -> result page is 404, 500, or just dead); I have found these for Pepsi, Nike etc and then send them our proposal. When we started, the hourly was 150E/hr and one of the first we emailed (in London this was) came back and asked if we do entire projects as 150/hr was less than he paid the current people.