On rims or just the tires? No rims - $200 - $250. With rims $400-$500.
Hard to say how much life is left. I usually hope to get 3-4 winters out of a set but our car sees 30,000 km per year. Probably at least 2 winters remaining.
FWIW, I bought a set of used X-Ice's for $200 (no rims) that had about the same amount of mileage on them. Granted I bought them in April (long story).