Buy it from the dealer, it's 10 dollars or so.
Those look darker than fallout spots but it may be the pic.
When you rub your finger over the rust spots, do you feel a dip in the paint or a hole, like you would if it's a chip? If the paint underneath is still flat and not chipped, then it's most likely a surface problem and some rail dust stuck to your paint. A claybar and clay lubricant will fix this. This is very easy to do and you can do it yourself instead of the risk of having the dealer screw you.