First of all, I want to offer you my heartfelt condolences.
I think it’s pretty hard to put a price on these items without actually seeing them. Are they in good operating condition? Do they start easily? The asking price is always higher if it runs. Snowblowers will generally go for a higher price when the season arrives or just after you get hit with a big one.
Perhaps you may want to keep them for now. If they are in good operating condition maybe a neighbor would be willing to use them to do the job for you. I had a neighbor, who like yourself, unexpectedly lost her husband and all I did was blow her snow and cut her grass as needed, using her late husbands equipment. And everything worked out fine. If you still want to sell, maybe there is a good and honest lawn and garden equipment dealer who could help guide you. Ask around and see if anyone could make a recommendation for you.
I hope this helps a little.