I have always used Hayward’s who seem to get me a good deal both for my private aircraft and when I had three aircraft working on a flying club.
If something is substantially lower in would be wise it take a very careful look at the small print to check exactly what you are getting.
The people recommended by haywards paid up when one of the club aircraft had a prop shock load and did not increase the price, but you will not be surprised that the price went up after the second shock load !
I would also recommend that you have a very good look at the true replacement value of your aircraft as this may differ from the market value, I have seen people substantially out of pocket when they have tried to replace a well maintained aircraft with good avionics and low time engine when the hull value was based on a market price gleaned from the prices of old dogs advertised on the internet with a view to a quick sale to an unsuspecting buyer.