Fixing grade on concrete garage floor?
The cheapest solution is to cut a weep path that runs from the pooling point out the door, as long as you start shallow and keep increasing the depth the water would flow out.  Depending on what the drive way looks like if it is a hill that slopes down that might be all that is required.  Possibly make a cross type design with cuts to direct the water from the area your tires normally sit to a middle cut line.  I'd probably start with a 6' straight edge and find the lowest spots to mark them.  

The more expensive solution is to get the garage epoxy people to do it for you.  They'll grind the concrete for it to accept the epoxy coating and should be able to use self leveler to achieve a slope before doing the epoxy.