That is EXACTLY what I was going to say. In fact, I have less than
no faith in the BBB. It is nothing more than an advertising agency, for companies that pay their dues.
That said, about the trees... There is a lot of variation between the price quotes of different tree companies. And there is a lot of difference between "asking price" and what they'll actually do the job for.
A couple years ago, I had a big old Maple that was almost dead, and leaning toward the house. A guy who was cutting trees in the neighborhood came over & asked if I wanted him to cut it down & haul it away for $1,000. I told him & wanted to keep the wood & asking him his price to drop the tree. For $200 he did an excellent job.
Dicker with the guys a little bit.