Sorry for your losses. 
We have four necropsy labs in California. If you're close to Davis, Turlock, Tulare, or San Bernadino you can drop them off. Necropsy fee is $20. If you aren't close you can use their fedex number and overnight them. for less than $20.
This is how I ship mine:
https://www.backyardchickens.com/threads/how-to-send-a-bird-for-a-necropsy-pictures.799747/

We have four necropsy labs in California. If you're close to Davis, Turlock, Tulare, or San Bernadino you can drop them off. Necropsy fee is $20. If you aren't close you can use their fedex number and overnight them. for less than $20.
This is how I ship mine:
https://www.backyardchickens.com/threads/how-to-send-a-bird-for-a-necropsy-pictures.799747/