Edison Concreations sealed my 2 car garage for $998 and did a great job.
edison concreations inc - Home
1st day - cleaned and power washed
2nd day - applied epoxy base coat in color of house
3rd day - applied 2nd coat with speckles house trim colors
4th application was a clear epoxy and kept off of it for a couple days.
(included sand particles, so the surface isn't too slippery)
A friend also used them and they had to first remove a latex garage paint that was peeling. The job turned out just as good, but I do not know the cost.