Well, the vendor for LoadRunner gets (at list) between 2500-4000 USD per day plus expenses depending upon the services delivered. What you can get depends upon your sales skills and what technical skills you bring to the table to solve complex business and technical problems. The better your ability to solve problems that impact the bottom line of companies and the better your ability to comunicate your benefitsd to potential clients, the better your compensation per day.
... and on the other side of the scale, if you don't have much experience you're not likely to get a job at all. Free-lance testing is usually only done by someone very experienced that the client can trust to do the job properly. You can usually expect double your current pay.
In the UK, typically about £250-300 per day. As a Test Manager you can get to £500+.
Aim for really big projects. Royal bank of Scotland are migrating Ulster Bank. The last big migration they did required 600 testers. They were taking on any people who could spell 'test' (as long as they didn't get more than three letters wrong).
Turbografix, that was also the number I have been told by various test managers from various consultancies I know who were on that migration of Natwest to RBS, which was the last big one I remember...suspect the Ulster Bank migration will be smaller but still large.
Agile Testers of the World UNIT!
Just goes to show how wasteful banks can be with their I.T staff. I worked for another U.K bank that had contracted staff (testers) just sitting around doing nothing (paying agency about £50/60k per man). Needless to say that bank got taken over and first clear out was contract staff doing nothing.
I'm surprised that RBS was so wasteful. I actually worked for a consultancy that migrated all Natwest staff to RBS (not core systems). This test team was about 8, and RBS pushed back on employing any more testers.
Personally, I cant' see how a test team of 600 could be efficient.