Amazon has a couple Britax Car Seats on sale. 

Britax Parkway SGL Booster Seat, Cloudburst for $102.73 for the Livia Color
In June of 2011 it went for $94, but this is the lowest price it goes for.
This is a buy now price.

Britax Roundabout 55 Convertible Car Seat 2012, Onyx for $149.99
$144.99 is the lowest price, so this is a good price.

Britax Boulevard 70-G3 Convertible Car Seat, Onyx for $233
The lowest price was $229.48 on October 7. This is the right range for this car seat.
We love our Boulevard.

Britax Pavilion 70-G3 Convertible Car Seat, Onyx for $231.55
This is the lowest price. This is a buy now price.
Looks like this one has a key feature of not having to rethread.

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