OK, going out on a limb with this but....how mature is your 10-year-old and do you live in a (relatively) safe area? I would consider giving him the option to stay home, provided that he understands that he will probably not be able to have friend over until you come home.
I know that it was written several years ago, but John Holt gave this advice to a mother who had to work and had a much younger child. He thought that the boy being on his own much of the day was way better than going to school. He wrote about this in Teach Your Own. If your ds wants to do it and could use the time productively (for me that would mean responsibly reading, cooking-no oven or stove, maybe doing a little laundry, researching on the computer.) Why not? Really, if your son is responsible enough and he could wait until after school hours to see his friends and go out for activities, I'd be on board.
Although, I probably wouldn't advertise that he was alone for 8 hours a day, KWIM?