I don't remember the name of the co that the shelter gave us 1 month free insurance with Gracie Lou (black cat). All I remember is that neither our vet, the vet school, or ANY vet in our town or the 2 nearest towns takes that insurance. So it was rather worthless. We declined it when we got Capn Morgan from the Animal control people. They were astonished - they were SURE the vet school took it, but I called while standing there and it isn't taken by them or any vet they know - including those in the major cities around us.
Given that, I haven't looked into vet insurance further. I hope you can find a good policy at a reasonable price. We are lucky - our family vet is a neighbor of my parents and gives us a discount. also, she is the vet the ANimal control uses, so we were able to take Capn Morgan home 4 days earlier on the promise to take him to the vet the next week for neutering. And the surgery was included in the adoption fees.