17 liters is the smallest I've seen online, and they're more or less the same weight as mine.
When I had the same crisis with my computer screen (it was still under warranty but I couldn't lift it to take it to the lab), I finally went and bought a TFT screen. They were very expensive back then, but as a woman alone I thought having stuff at home that I can carry independently is worth the huge investment for me. So this time, first thing I did was look for a lighter microwave oven. But they don't make them lighter than 12 years ago, it seems... I have a back problem, so I won't invest in a new one till they make them lighter. I believe it's time manufacturers start thinking that behind every great woman not always there's a young, physically strong man. I'm sure the reason they haven't invested in research to make them lighter is that women alone, like me, shut up and don't complain, thinking it's US who are at fault for not having any man around.
BTW, a neighbor crossed my way when I was struggling with the oven across the lobby. He didn't offer to help. I'll be sure to leave him bleeding on the floor if I ever cross him when he's in need.
_________________
So-called white lies are like fake jewelry. Adorn yourself with them if you must, but expect to look cheap to a connoisseur.