Gift for Mom

My mother hates it when dust covers her floor, but recently she have trouble with her back and can't dedicate as much time to cleaning as she used to. I come up with bright idea to gift her this upcoming Mother's Day with one of this cool iRobot Vacuum Cleaner, so she doesn't need to bend so much anymore. Unfortunately, after researching and reading reviews, I found out that with my pocket money savings, I'm still short of $317. Can you pease help me reach my goal? Any help will be greatly appreciated!