Tell me another one!
Get away with you!
--> I would say that these are very old fashioned now.
In a pig's eye!
Get along with you!
--> I've never heard of these ones personally (the second one just sounds like an unnatural version of "Get away with you!" though).
Come off it!
--> This one isn't bad I guess but isn't so common in my opinion.
Here are some more common (and modern) examples:
"Are you joking?!"