It really depends on what coverages you want.
Are you interested in just liability?
Will you be adding on all of your equipment to be covered?
Do you need to be covered for pesticide use?
These are all things that you need to consider. I am insured for up to 1million$ for liability including pest use. My policy also covers all of my equipment. I am a little below $1000 in price.
I do not do this for the love of the game. I do this for the money.