You need to check the big landscapers in your area. Depending on your location, like if you are in Miami, people in homestead are dumping 10 footers for less than $100. Even though they are larger, it may not be worth the money and time to crane those out and give you money for them and make any money on that.

You can try to sell them. You can also offer to give them away in return the taker back fills the holes. Make sure they use big machinery and know what they are doing. Cheaper then paying somebody to cut them down.

New homes always want large palms.