Julie,
I am sincerely sorry for your loss. My best advice is not to do anything in a hurry. When you feel up to it, record the brands and model numbers for future reference. Take some time to contact some of the people named above. Albert Portis, or Larry Edwards would probably be a good place to start. Although we have no way of knowing what equipment is in your collection, it could be valuable.
Above all, resist the temptation to have well-meaning audiophiles hurry to your home to evaluate what you have. Get a few quotes so that you can decide who, or which method, will bring you the highest return. It may be that the best method will be auction. If possible, try to contact one of you husband's audiophile friends (assuming he had some). Just remember the old adage: Decide in haste, repent at leisure. Best of luck in whatever you decide!