Michelle, sorry for your loss. I hope that you are doing well and that selling these and other items left from your husbands life, will assist in finding closure and reduce any pain you endure through this time in your life.
my suggestion would be to contact the dealer your husband dealt with and see if he would consider consignement to help you sell this equipment. That would allow him to make a little money and maybe for you to maximize your returns. This method would be better than
asking the dealer to buy it as a package at wholesale. If he is the dealer that sold most of the equipment to your husband and is avoid dealer, he should be more than happy to assist you.
If the dealer is not willing, then post an ad here on Audiogon, hopefully you have all the original boxes. And contact a shipping company and see if you palletize this system as a single package so that it can be shipped. It would help if you could provide a list of the equipment here in this thread. Then we can maybe provide some guidance as to what values you should seek.
Again, my sympathies
Theo