Just spoke with that place I linked to above. They sent me to this link:
http://www.garagefloorcoatingofmn.co...r-coating.html
Rough estimate he gave me was:
Silver = $3500
Gold = $4000
Platinum = $4500
Holy yuck, that's some serious cashola. I think I'm going to keep looking for more quotes. I'm just very hesitant to use the off the shelf stuff from Lowe's. Just don't trust it to last for a long time. In 5 years I don't want it to be total crap looking, and wishing I would have had it done professionally in the first place.