"To get money off (something)" can be used when talking about deals and discounts, for example:
You can get money off drinks if you order a full course dinner.
However, can I use the same expression when talking about someone gaining money from someone else? Examples:
Don't trust everything she says, she's just trying to get money off you.
Don't trust everything she says, she's just trying to get money off of you.
Are these two uses correct? If so, which one should be preferred?