Thought it might be a fluke. I went to book a car for next week in Denver, and the rates were much lower than I'm used to (about $25 a day for full-size). On the final screen, it offered to upgrade me to a Lincoln Town Car for only $3259 more a day. Tried a different city and got a similar number. Haven't owned a Lincoln in quite some time, but could probably buy one for the weekly rental rate.