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Melanie Said:

How much is commercial car insurance?

We Answered:

It would depend on what type of vehicles you had but I'm assuming with a courier service it would probably be economy vans.
Also it would depend on the driving records of your 6 drivers, but with those limits for a yearly rate I think somewhere in the order of $1500 - $2000 would seem realistic.
Edit...
As I reread your question I noticed that you included a seperate qualification of General Liability coverage. This would normally be a seperate policy from your auto insurance and would cover things such as your courier drops a heavy box on an elderly man breaking his hip. This would be a General Liability policy and with a $1M limit, you can expect that to run another $500 a year or so.
Combined you could probably safely say $2500/yr.