Hi M.,
It's M. again. Just to let you know, you can post an ad (for free) on Craig's List; people are always selling car seats and other stuff on there. In the ad line, just make sure to post WANTED to let people know you need it. http://tampa.craigslist.org. Go under For Sale, Baby and Kids, and you can post your ad. I needed an extra car seat for my mom's car and got a nice one for $20, and it looked brand new. Also, I got my Britax Marathon on Froogle.com. It's a website Google has and they list all Britax and all the prices of them, and you can search in a certain price range. Both myself, and my 2 friends got ours $80 cheaper (and with free shipping) because we got the fabrics Britax was discontinuing. Good luck :)