The kind of pet (dog/cat? large animal? exotic?) makes a big difference. When I asked a bit over five years ago for my then-puppy, the person at Angell who spoke to me recommended Trupanion.
Personally, I have Nationwide Pet Insurance I paid in total a little over 600 for the year, about $53 a month for full coverage. They have a $100 deductible before they pay out up to 90%, it's been so worth it, I have received thousands in return.
Thanks! Your answer is awaiting moderation.