Guys, need help finding a small snow blower for dad......

We had to remove the snow off the roof other day. Dad climbs up there and I try to clear it off on ground. This snow packed so hard on landing, I can't move it with my machines. I thought to make dad's life easier to get a gas powered shovel type blower. Something he could carry up there. I know how stubborn he is and that he won't wait for me to assist him after work. Any idea where I can find one?? I looked online and it looks like they are only electric. That won't work due to cords getting caught and such.
Any help will be welcome!! ;)
Thanks
Eric