Bus From Toronto To Windsor What Is The Cheapest Way To Windsor, Ontario?

What is the cheapest way to Windsor, Ontario? - bus from toronto to windsor

I live in Toronto and I intend to travel to Windsor, Ontario. What is the best way to go? Is there a bus to Windsor, as they to do with Niagara Falls? Here are my options as I see so far:

Greyhound --
VIA Rail

Are there other options?